ci: build and test tntcxx on macos 11 and 12

The project is tested in both Release and Debug modes on each version of
macos. Tarantool is installed from brew, the last stable version is used.
The workflow is defined in the same file as Ubuntu workflow, so the file
is renamed to "testing".

Author: drewdzzz

.github/workflows/ubuntu.yml renamed to .github/workflows/testing.yml

@@ -1,4 +1,4 @@
-name: ubuntu
+name: testing
 
 on:
   workflow_dispatch:
@@ -15,8 +15,8 @@ jobs:
         runs-on:
           - ubuntu-20.04
           - ubuntu-22.04
-        tarantool:
-          - '2.11'
+          - macos-11
+          - macos-12
         mode:
           - Debug
           - Release
@@ -27,16 +27,22 @@ jobs:
       - name: Clone the connector
         uses: actions/checkout@v3
 
-      - name: Setup tarantool ${{ matrix.tarantool }}
+      - name: Setup tarantool 2.11
+        if: startsWith(matrix.runs-on, 'ubuntu')
         uses: tarantool/setup-tarantool@v1
         with:
-          tarantool-version: ${{ matrix.tarantool }}
+          tarantool-version: '2.11'
+
+      - name: Setup stable tarantool from brew
+        if: startsWith(matrix.runs-on, 'macos')
+        run: brew install tarantool
 
       - name: build
         run: |
           mkdir build
           cd build
           cmake -DCMAKE_BUILD_TYPE=${{ matrix.mode }} -DTNTCXX_BUILD_TESTING=ON -DTNTCXX_ENABLE_SSL=OFF .. 
           make -j
+
       - name: test
         run: cd build && ctest --output-on-failure