Change ubuntu usage from latest to 20.04

.github/workflows/android.yml

@@ -21,7 +21,7 @@ concurrency:
 
 jobs:
   prepare_matrix:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     outputs:
       matrix_os: ${{ steps.export-result.outputs.matrix_os }}
       matrix_architecture: ${{ steps.export-result.outputs.matrix_architecture }}

.github/workflows/checks.yml

@@ -17,7 +17,7 @@ concurrency:
 
 jobs:
   file_format_check:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
         with:
@@ -40,7 +40,7 @@ jobs:
 
   check_integration_test_labels:
     # This check fails if integration tests are queued, in progress, or failed.
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
     - uses: docker://agilepathway/pull-request-label-checker:latest
       with:
@@ -49,7 +49,7 @@ jobs:
 
   generated_docs_check:
     # This check succeeds if Doxygen documentation generates without errors.
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
         with:
@@ -88,7 +88,7 @@ jobs:
 
   copyright_check:
     # Check for Google copyright in each file.
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
         with:
@@ -100,7 +100,7 @@ jobs:
 
   release_notes_check:
     # Check that the readme was updated, unless the PR has a specific label set (env.skipReleaseNotesLabel).
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
         # Skip this if the PR has the skipReleaseNotes label or if it's a merge to other than main.

.github/workflows/checks_secure.yml

@@ -12,7 +12,7 @@ concurrency:
 jobs:
   dismiss_stale_approvals:
     # Dismiss stale approvals for non-admins or if this PR comes from a fork.
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     # Only if another commit was added to the PR.
     steps:
       - name: Check user permission

.github/workflows/cpp-packaging.yml

@@ -42,7 +42,7 @@ env:
 jobs:
   log_inputs:
     name: log-inputs
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: log run inputs
         run: |
@@ -79,9 +79,9 @@ jobs:
     if: ${{ github.event.inputs.downloadPublicVersion == '' && github.event.inputs.downloadPreviousRun == '' }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-12]
+        os: [ubuntu-20.04, macos-12]
         include:
-        - os: ubuntu-latest
+        - os: ubuntu-20.04
           tools_platform: linux
           # Binutils 2.35.1 released Sep 19, 2020
           binutils_version: "2.35.1"
@@ -243,7 +243,7 @@ jobs:
 
   build_and_package_android:
     name: build-and-package-android
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     if: ${{ github.event.inputs.downloadPublicVersion == '' && github.event.inputs.downloadPreviousRun == '' }}
     strategy:
       fail-fast: false
@@ -305,7 +305,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-latest, ubuntu-latest, macos-12]
+        os: [windows-latest, ubuntu-20.04, macos-12]
         build_type: ["Release", "Debug"]
         architecture: ["x64", "x86", "arm64"]
         msvc_runtime: ["static", "dynamic"]
@@ -321,7 +321,7 @@ jobs:
           vcpkg_triplet_suffix: "windows-static-md"
           additional_build_flags: "--build_tests"
           sdk_platform: "windows"
-        - os: ubuntu-latest
+        - os: ubuntu-20.04
           vcpkg_triplet_suffix: "linux"
           additional_build_flags: ""
           sdk_platform: "linux"
@@ -341,11 +341,11 @@ jobs:
           linux_abi: "c++11"
         - os: macos-12
           build_type: "Debug"
-        - os: ubuntu-latest
+        - os: ubuntu-20.04
           msvc_runtime: "dynamic"
-        - os: ubuntu-latest
+        - os: ubuntu-20.04
           build_type: "Debug"
-        - os: ubuntu-latest
+        - os: ubuntu-20.04
           architecture: "arm64"
         - os: windows-latest
           architecture: "arm64"
@@ -464,40 +464,40 @@ jobs:
       matrix:
         sdk_platform: [linux, darwin, windows]
         suffix: ['']
-        runs_on_platform: [ubuntu-latest]
+        runs_on_platform: [ubuntu-20.04]
         include:
         # Split windows packaging into multiple runners.
         - sdk_platform: windows
           suffix: '-x86-Release-static'
-          runs_on_platform: ubuntu-latest
+          runs_on_platform: ubuntu-20.04
         - sdk_platform: windows
           suffix: '-x86-Release-dynamic'
-          runs_on_platform: ubuntu-latest
+          runs_on_platform: ubuntu-20.04
         - sdk_platform: windows
           suffix: '-x64-Release-static'
-          runs_on_platform: ubuntu-latest
+          runs_on_platform: ubuntu-20.04
         - sdk_platform: windows
           suffix: '-x64-Release-dynamic'
-          runs_on_platform: ubuntu-latest
+          runs_on_platform: ubuntu-20.04
         - sdk_platform: windows
           suffix: '-x86-Debug-static'
-          runs_on_platform: ubuntu-latest
+          runs_on_platform: ubuntu-20.04
         - sdk_platform: windows
           suffix: '-x86-Debug-dynamic'
-          runs_on_platform: ubuntu-latest
+          runs_on_platform: ubuntu-20.04
         - sdk_platform: windows
           suffix: '-x64-Debug-static'
-          runs_on_platform: ubuntu-latest
+          runs_on_platform: ubuntu-20.04
         - sdk_platform: windows
           suffix: '-x64-Debug-dynamic'
-          runs_on_platform: ubuntu-latest
+          runs_on_platform: ubuntu-20.04
         - sdk_platform: darwin
           runs_on_platform: macos-12
         exclude:
         - sdk_platform: windows
           suffix: ''
         - sdk_platform: darwin
-          runs_on_platform: ubuntu-latest
+          runs_on_platform: ubuntu-20.04
     steps:
       - name: setup Xcode version (macos)
         if: runner.os == 'macOS'
@@ -649,7 +649,7 @@ jobs:
 
   download_sdk_package:
     name: download-sdk-package
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     needs: [log_inputs]
     if: ${{ github.event.inputs.downloadPublicVersion != '' || github.event.inputs.downloadPreviousRun != '' }}
     steps:
@@ -699,7 +699,7 @@ jobs:
 
   merge_packages:
     name: final-merge-packages
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     if: ${{ github.event.inputs.downloadPublicVersion == '' && github.event.inputs.downloadPreviousRun == '' }}
     needs: [build_and_package_ios_tvos, build_and_package_android, package_desktop, log_inputs]
     steps:
@@ -763,7 +763,7 @@ jobs:
     # Clean up intermediate artifacts from packaging step.
     # This can happen after the final package merge is finished.
     name: cleanup-packaging-artifacts
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     needs: [merge_packages]
     if: |
       (
@@ -784,7 +784,7 @@ jobs:
     # Trigger the integration_tests workflow.
     needs: [merge_packages, download_sdk_package, cleanup_packaging_artifacts]
     if: (github.event.inputs.skipIntegrationTests == 0 || github.event.inputs.skipIntegrationTests == '') && !cancelled() && !failure()
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
     - name: Checkout repo
       uses: actions/checkout@v3

.github/workflows/desktop.yml

@@ -20,7 +20,7 @@ concurrency:
 
 jobs:
   prepare_matrix:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     outputs:
       matrix_os: ${{ steps.export-result.outputs.matrix_os }}
       matrix_build_type: ${{ steps.export-result.outputs.matrix_build_type }}
@@ -70,24 +70,24 @@ jobs:
             msvc_runtime: "dynamic"
         exclude:
           # msvc_runtime excludes
-          - os: ubuntu-latest
+          - os: ubuntu-20.04
             msvc_runtime: "dynamic"
           - os: macos-12
             msvc_runtime: "dynamic"
           # architecture excluees
           - os: macos-12
             architecture: "x86"
           # Xcode excludes -- allow only one on osx and linux
-          - os: ubuntu-latest
+          - os: ubuntu-20.04
             xcode_version: "11.7"
           - os: windows-latest
             xcode_version: "11.7"
-          - os: ubuntu-latest
+          - os: ubuntu-20.04
             xcode_version: "12.5.1"
           - os: windows-latest
             xcode_version: "12.5.1"
           # arm64 is only for macos
-          - os: ubuntu-latest
+          - os: ubuntu-20.04
             architecture: "arm64"
           - os: windows-latest
             architecture: "arm64"
@@ -292,7 +292,7 @@ jobs:
     ### It's possible to add more apps here once integration tests are less flaky.
     name: local-integration-tests-linux-openssl
     needs: prepare_matrix
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
     steps:
@@ -331,15 +331,15 @@ jobs:
           python scripts/gha/build_testapps.py --p Desktop \
             --t ${apis} \
             --output_directory "${{ github.workspace }}" \
-            --artifact_name "desktop-ubuntu-latest-openssl" \
+            --artifact_name "desktop-ubuntu-20.04-openssl" \
             --noadd_timestamp \
             --short_output_paths \
             --cmake_flag=-DFIREBASE_QUICK_TEST=ON
       - name: Summarize build results
         if: ${{ !cancelled() }}
         shell: bash
         run: |
-          cat build-results-desktop-ubuntu-latest-openssl.log
+          cat build-results-desktop-ubuntu-20.04-openssl.log
           if [[ "${{ job.status }}" != "success" ]]; then
             exit 1
           fi
@@ -361,15 +361,15 @@ jobs:
           java-version: '17'
       - name: Run Desktop integration tests
         run: |
-          cp scripts/gha/integration_testing/google-services.json testapps-desktop-ubuntu-latest-openssl/firestore/google-services.json
-          firebase emulators:exec --only firestore --project demo-example 'python scripts/gha/desktop_tester.py --testapp_dir testapps-desktop-ubuntu-latest-openssl --logfile_name "desktop-ubuntu-latest-openssl"'
+          cp scripts/gha/integration_testing/google-services.json testapps-desktop-ubuntu-20.04-openssl/firestore/google-services.json
+          firebase emulators:exec --only firestore --project demo-example 'python scripts/gha/desktop_tester.py --testapp_dir testapps-desktop-ubuntu-20.04-openssl --logfile_name "desktop-ubuntu-20.04-openssl"'
         env:
           USE_FIRESTORE_EMULATOR: true
       - name: Summarize test results
         if: ${{ !cancelled() }}
         shell: bash
         run: |
-          cat testapps-desktop-ubuntu-latest-openssl/test-results-desktop-ubuntu-latest-openssl.log
+          cat testapps-desktop-ubuntu-20.04-openssl/test-results-desktop-ubuntu-20.04-openssl.log
           if [[ "${{ job.status }}" != "success" ]]; then
             exit 1
           fi

.github/workflows/integration_tests.yml

@@ -20,7 +20,7 @@ on:
         required: true
       operating_systems:
         description: 'CSV of VMs to run on'
-        default: 'ubuntu-latest,windows-latest,macos-12'
+        default: 'ubuntu-20.04,windows-latest,macos-12'
         required: true
       desktop_ssl_variants:
         description: 'CSV of desktop SSL variants to use'
@@ -55,7 +55,7 @@ env:
 
 jobs:
   check_and_prepare:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     outputs:
       trigger: ${{ steps.set_outputs.outputs.trigger }}
       github_ref: ${{ steps.set_outputs.outputs.github_ref }}
@@ -250,7 +250,7 @@ jobs:
         # Do not attempt to use arm64 on Windows or Linux.
         - os: windows-latest
           arch: arm64
-        - os: ubuntu-latest
+        - os: ubuntu-20.04
           arch: arm64
         # Do not attempt to use x86 on Mac.
         - os: macos-12
@@ -698,7 +698,7 @@ jobs:
         # Do not attempt to use arm64 on Windows or Linux.
         - os: windows-latest
           arch: arm64
-        - os: ubuntu-latest
+        - os: ubuntu-20.04
           arch: arm64
         # Do not attempt to use x86 on Mac.
         - os: macos-12
@@ -817,7 +817,7 @@ jobs:
         runner_label: ['${{ needs.check_and_prepare.outputs.runner_label_macos_arm64 }}']
         exclude:
         # Don't run Linux or Windows tests on the Mac arm64 runner.
-        - os: ubuntu-latest
+        - os: ubuntu-20.04
           runner_label: ${{ needs.check_and_prepare.outputs.runner_label_macos_arm64 }}
         - os: windows-latest
           runner_label: ${{ needs.check_and_prepare.outputs.runner_label_macos_arm64 }}
@@ -1318,7 +1318,7 @@ jobs:
   summarize_results:
     name: "summarize-results"
     needs: [check_and_prepare, test_desktop, test_desktop_custom_runners, test_android, test_ios, test_tvos]
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     if: ${{ !cancelled() }}
     steps:
       - uses: actions/checkout@v3

.github/workflows/ios.yml

@@ -19,7 +19,7 @@ concurrency:
 
 jobs:
   prepare_matrix:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     outputs:
       matrix_xcode_version: ${{ steps.export-result.outputs.matrix_xcode_version }}
     steps:

.github/workflows/lint.yml

@@ -10,7 +10,7 @@ concurrency:
 
 jobs:
   lint_warnings_check_and_comment:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
         with:

.github/workflows/reviewer-roulette.yml

@@ -10,7 +10,7 @@ env:
 jobs:
   assign_random_reviewer:
     if: github.event.action == 'labeled' && github.event.label.name == 'reviewer-roulette'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Unset label
         uses: buildsville/add-remove-label@v1