Add GitHub actions to check formatting and run tests

.github/workflows/check-formatting.yml

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+name: Code formatting check
+
+on:
+  pull_request:
+
+# Cancel previous runs if a more recent commit is pushed.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref }}
+  cancel-in-progress: true
+
+permissions: read-all
+
+jobs:
+  clang-format-check:
+    name: clang-format
+    runs-on: "ubuntu-20.04"
+    steps:
+      - name: Setup clang-format
+        run: |
+          sudo apt-get install -yqq clang-format-12
+      - name: Checkout repository
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: '0'
+      - name: Switch to pull request branch
+        run: |
+          git checkout ${GITHUB_SHA}
+      - name: Run clang-format
+        run: |
+          git diff origin/${{ github.base_ref }} -U0 --no-color -- '**/*.cpp' '**/*.cc' '**/*.h' '**/*.hh' '**/*.hpp' \
+            | clang-format-diff-12 -p1 >not-formatted.diff 2>&1
+      - name: Check formatting
+        run: |
+          if ! grep -q '[^[:space:]]' not-formatted.diff ; then
+            echo "Code is formatted."
+          else
+            echo "Code is not formatted."
+            echo "Run clang-format-diff on your changes:"
+            echo "    git diff origin/${{ github.base_ref }} -U0 --no-color | clang-format-diff -p1 -i"
+            echo ""
+            echo "You can disable clang-format for specific code blocks. Follow https://clang.llvm.org/docs/ClangFormatStyleOptions.html#disabling-formatting-on-a-piece-of-code."
+            echo ""
+            echo "Diff:"
+            cat not-formatted.diff
+            echo ""
+            exit 3
+          fi

.github/workflows/linux-bazel-build.yml

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+name: Linux build
+
+on:
+  pull_request:
+
+# Cancel previous runs if a more recent commit is pushed.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref }}
+  cancel-in-progress: true
+
+permissions: read-all
+
+jobs:
+  linux-build:
+    name: Build and run tests on Linux using CMake
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: '0'
+      - name: Switch to pull request branch and clone submodules
+        run: |
+          git checkout ${GITHUB_SHA}
+          git submodule update --init --recursive
+      - name: Build
+        run: |
+          mkdir build
+          cd build
+          cmake .. -DSPIRV_REFLECT_BUILD_TESTS=ON
+          make -j $(nproc)
+      - name: Run unit tests
+        run: |
+          cd build
+          ./test-spirv-reflect

.github/workflows/windows-build.yml

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+name: Windows build
+
+on:
+  pull_request:
+
+# Cancel previous runs if a more recent commit is pushed.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref }}
+  cancel-in-progress: true
+
+permissions: read-all
+
+jobs:
+  windows-build:
+    name: Build and run unit tests on Windows
+    runs-on: windows-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: '0'
+      - name: Switch to pull request branch and clone submodules
+        run: |
+          git checkout ${GITHUB_SHA}
+          git submodule update --init --recursive
+      - name: Build
+        run: |
+          mkdir build
+          cd build
+          cmake -G "Visual Studio 17 2022" -A x64 -DSPIRV_REFLECT_BUILD_TESTS=ON
+
+          cmake --build . --config Release -- /nologo /verbosity:minimal /maxcpucount
+      - name: Run unit tests
+        run: |
+          cd build
+          ./test-spirv-reflect.exe