Add continuous integration workflows. [nmoinvaz]

These workflows will be run to verify that project generation,
source file compilation, and test cases run successfully.

.github/workflows/cmake.yml

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+name: CMake
+on: [push, pull_request]
+jobs:
+  ci-cmake:
+    name: ${{ matrix.name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: Ubuntu GCC
+            os: ubuntu-latest
+            compiler: gcc
+
+          - name: Ubuntu GCC ISB
+            os: ubuntu-latest
+            compiler: gcc
+            build-dir: "."
+            src-dir: "."
+
+          - name: Ubuntu Clang
+            os: ubuntu-latest
+            compiler: clang
+
+          - name: Ubuntu Clang Debug
+            os: ubuntu-latest
+            compiler: clang
+            build-config: Debug
+
+          - name: Windows MSVC Win32
+            os: windows-latest
+            compiler: cl
+            cmake-args: -A Win32
+
+          - name: Windows MSVC Win64
+            os: windows-latest
+            compiler: cl
+            cmake-args: -A x64
+
+          - name: macOS Clang
+            os: macos-latest
+            compiler: clang
+
+          - name: macOS GCC
+            os: macos-latest
+            compiler: gcc-9
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+
+    - name: Generate project files
+      run: cmake -S ${{ matrix.src-dir || '../zlib' }} -B ${{ matrix.build-dir || '../build' }} ${{ matrix.cmake-args }} -D CMAKE_BUILD_TYPE=${{ matrix.build-config || 'Release' }}
+      env:
+        CC: ${{ matrix.compiler }}
+
+    - name: Compile source code
+      run: cmake --build ${{ matrix.build-dir || '../build' }} --config ${{ matrix.build-config || 'Release' }}
+
+    - name: Run test cases
+      run: ctest -C Release --output-on-failure --max-width 120
+      working-directory: ${{ matrix.build-dir || '../build' }}

.github/workflows/configure.yml

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+name: Configure
+on: [push, pull_request]
+jobs:
+  ci-configure:
+    name: ${{ matrix.name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: Ubuntu GCC
+            os: ubuntu-latest
+            compiler: gcc
+            configure-args: --warn
+
+          - name: Ubuntu GCC ISB
+            os: ubuntu-latest
+            compiler: gcc
+            configure-args: --warn
+            build-dir: "."
+            src-dir: "."
+
+          - name: macOS GCC
+            os: macos-latest
+            compiler: gcc-9
+            configure-args: --warn
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+
+    - name: Generate project files
+      run: |
+        [ -d ${{ matrix.build-dir || '../build' }} ] || mkdir ${{ matrix.build-dir || '../build' }}
+        cd ${{ matrix.build-dir || '../build' }}
+        ${{ matrix.src-dir || '../zlib' }}/configure ${{ matrix.configure-args }}
+      env:
+        CC: ${{ matrix.compiler }}
+
+    - name: Compile source code
+      run: make -j2
+      working-directory: ${{ matrix.build-dir }}
+
+    - name: Run test cases
+      run: make test
+      working-directory: ${{ matrix.build-dir }}

.github/workflows/fuzz.yml

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+name: OSS-Fuzz
+on: [pull_request]
+jobs:
+  Fuzzing:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Build Fuzzers
+      uses: google/oss-fuzz/infra/cifuzz/actions/build_fuzzers@master
+      with:
+        oss-fuzz-project-name: 'zlib'
+        dry-run: false
+
+    - name: Run Fuzzers
+      uses: google/oss-fuzz/infra/cifuzz/actions/run_fuzzers@master
+      with:
+        oss-fuzz-project-name: 'zlib'
+        fuzz-seconds: 300
+        dry-run: false
+
+    - name: Upload Crash
+      uses: actions/upload-artifact@v3
+      if: failure()
+      with:
+        name: artifacts
+        path: ./out/artifacts