Build linux binaries in alpine container

.github/workflows/build.yml

@@ -12,14 +12,13 @@ on:
       - '*-check-build'
 
 jobs:
-  build:
+  build-mac-win:
     runs-on: ${{ matrix.os }}
-
     strategy:
       fail-fast: false
       matrix:
         ghc: ['9.0.1', '8.10.7', '8.10.6', '8.8.4', '8.6.5']
-        os: [ubuntu-18.04, macOS-latest, windows-latest]
+        os: [macOS-latest, windows-latest]
         cabal: ['3.6']
 
     steps:
@@ -154,6 +153,127 @@ jobs:
         name: haskell-language-server-wrapper-${{ runner.OS }}${{env.EXE_EXT}}.${{ steps.compress_wrapper_binary.outputs.extension }}
         path: ${{ steps.compress_wrapper_binary.outputs.path }}
 
+  build-linux:
+    runs-on: ubuntu-latest
+    container: alpine:3.12
+
+    strategy:
+      fail-fast: false
+      matrix:
+        ghc: ['9.0.1', '8.10.7', '8.10.6', '8.8.4', '8.6.5']
+        cabal: ['3.6']
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        submodules: true
+    - uses: haskell/actions/setup@v1
+      with:
+        ghc-version  : ${{ matrix.ghc   }}
+        cabal-version: ${{ matrix.cabal }}
+
+    - name: Use modified cabal.project for ghc9
+      if: ${{ matrix.ghc == '9.0.1' }}
+      run: cp cabal-ghc901.project cabal.project
+
+    - name: Shorten binary names
+      run: |
+        sed -i.bak -e 's/haskell-language-server/hls/g' \
+                   -e 's/haskell_language_server/hls/g' \
+                   haskell-language-server.cabal cabal.project
+        sed -i.bak -e 's/Paths_haskell_language_server/Paths_hls/g' \
+                   src/**/*.hs exe/*.hs
+
+    - name: Set some linux specific things
+      if: matrix.os == 'ubuntu-18.04'
+      env:
+        GHC_VER: ${{ matrix.ghc }}
+      run: |
+        echo "LINUX_CABAL_ARGS=--enable-executable-static --ghc-options=-split-sections" >> $GITHUB_ENV
+        echo "GHC_VERSION=$GHC_VER" >> $GITHUB_ENV
+
+    - name: Build server
+      # Try building it twice in case of flakey builds on Windows
+      run: |
+        cabal build exe:hls -O2 $LINUX_CABAL_ARGS || \
+        cabal build exe:hls -O2 $LINUX_CABAL_ARGS -j1
+
+    - name: Compress server binary
+      id: compress_server_binary
+      run: |
+        HLS_BUILD=$(find dist-newstyle \( -name 'hls' -o -name 'hls.exe' \) -type f)
+        HLS=haskell-language-server-${{env.GHC_VERSION}}
+        mv $HLS_BUILD $HLS${{env.EXE_EXT}}
+        if [[ "$OSTYPE" == "msys" ]]; then
+          7z a $HLS.zip $HLS${{env.EXE_EXT}}
+          echo ::set-output name=path::$HLS.zip
+          echo ::set-output name=content_type::application/zip
+          echo ::set-output name=extension::zip
+        else
+          gzip --best $HLS
+          echo ::set-output name=path::$HLS.gz
+          echo ::set-output name=content_type::application/gzip
+          echo ::set-output name=extension::gz
+        fi
+
+    - name: Upload server to release
+      if: ${{ !contains(github.ref_name, 'check') }}
+      uses: actions/[email protected]
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        upload_url: ${{ github.event.release.upload_url }}
+        asset_path: ${{ steps.compress_server_binary.outputs.path }}
+        asset_name: haskell-language-server-${{ runner.OS }}-${{ env.GHC_VERSION }}${{env.EXE_EXT}}.${{ steps.compress_server_binary.outputs.extension }}
+        asset_content_type: ${{ steps.compress_server_binary.outputs.content_type }}
+
+    - name: Upload server to workflow artifacts
+      uses: actions/upload-artifact@v2
+      with:
+        name: haskell-language-server-${{ runner.OS }}-${{ matrix.ghc }}${{env.EXE_EXT}}.${{ steps.compress_server_binary.outputs.extension }}
+        path: ${{ steps.compress_server_binary.outputs.path }}
+
+    - name: Build wrapper
+      if: matrix.ghc == '8.10.7'
+      run: cabal build exe:hls-wrapper -O2 $LINUX_CABAL_ARGS
+
+    - name: Compress wrapper binary
+      if: matrix.ghc == '8.10.7'
+      id: compress_wrapper_binary
+      run: |
+        HLS_WRAPPER_BUILD=$(find dist-newstyle \( -name 'hls-wrapper' -o -name 'hls-wrapper.exe' \) -type f)
+        HLS_WRAPPER=haskell-language-server-wrapper
+        mv $HLS_WRAPPER_BUILD $HLS_WRAPPER${{env.EXE_EXT}}
+        if [[ "$OSTYPE" == "msys" ]]; then
+          7z a $HLS_WRAPPER.zip $HLS_WRAPPER${{env.EXE_EXT}}
+          echo ::set-output name=path::$HLS_WRAPPER.zip
+          echo ::set-output name=content_type::application/zip
+          echo ::set-output name=extension::zip
+        else
+          gzip --best $HLS_WRAPPER
+          echo ::set-output name=path::$HLS_WRAPPER.gz
+          echo ::set-output name=content_type::application/gzip
+          echo ::set-output name=extension::gz
+        fi
+
+    - name: Upload wrapper to the release
+      if: ${{ matrix.ghc == '8.10.7' && !contains(github.ref_name, 'check') }}
+      uses: actions/[email protected]
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        upload_url: ${{ github.event.release.upload_url }}
+        asset_path: ${{ steps.compress_wrapper_binary.outputs.path }}
+        asset_name: haskell-language-server-wrapper-${{ runner.OS }}${{env.EXE_EXT}}.${{ steps.compress_wrapper_binary.outputs.extension }}
+        asset_content_type: ${{ steps.compress_wrapper_binary.outputs.content_type}}
+
+    - name: Upload wrapper to workflow artifacts
+      uses: actions/upload-artifact@v2
+      if: matrix.ghc == '8.10.7'
+      with:
+        name: haskell-language-server-wrapper-${{ runner.OS }}${{env.EXE_EXT}}.${{ steps.compress_wrapper_binary.outputs.extension }}
+        path: ${{ steps.compress_wrapper_binary.outputs.path }}
+
   # generates a custom tarball with sources, used by `ghcup compile hls`
   src-tar:
     needs: build