c.i.: Add github actions

.github/workflows/actions/build-and-test/action.yml

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+name: Build and test
+
+inputs:
+  build_dir:
+    description: "The build dir to use"
+    required: true
+  std:
+    description: "The C++ standard to use"
+    required: true
+  build_type:
+    description: "The build type to use"
+    default: Debug
+  sse3:
+    description: "Whether to enable sse3"
+    default: OFF
+  avx:
+    description: "Whether to enable avx"
+    default: OFF
+  pure:
+    description: "Whether to enable pure"
+    default: OFF
+  lang_extensions:
+    description: "Whether to enable lang extensions"
+    default: OFF
+
+runs:
+  using: "composite"
+  steps:
+    - name: Build GLM
+      shell: bash
+      run: |
+        mkdir -p ${{ inputs.build_dir }}
+
+        cmake -DCMAKE_INSTALL_PREFIX=$RUNNER_TEMP/install \
+              -DCMAKE_BUILD_TYPE=${{ inputs.build_type }} \
+              -DGLM_TEST_ENABLE=ON \
+              -DGLM_TEST_ENABLE_CXX_${{ inputs.std}}=ON \
+              -DGLM_TEST_ENABLE_SIMD_SSE3=${{ inputs.sse3 }} \
+              -DGLM_TEST_ENABLE_SIMD_AVX=${{ inputs.avx }} \
+              -DGLM_TEST_FORCE_PURE=${{ inputs.pure }} \
+              -DGLM_TEST_ENABLE_LANG_EXTENSIONS=${{ inputs.lang_extensions }} \
+              -S . \
+              -B ${{ inputs.build_dir }}
+        cmake --build ${{ inputs.build_dir }} --parallel 2
+
+    - name: Run tests
+      shell: bash
+      run:
+        ctest --test-dir ${{ inputs.build_dir }} --output-on-failure --parallel 4

.github/workflows/github-actions-demo.yml

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+name: GLM Unit Tests
+
+run-name: ${{ github.actor }} is running GLM unit tests
+on: [push]
+
+jobs:
+  Explore-GitHub-Actions:
+    name: "${{ matrix.os}} ${{ matrix.cxx }} C++:${{ matrix.std }}"
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        std: [98, 11, 14, 17, 20]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        config: [Debug, Release]
+
+#    env:
+#      CXX: ${{ matrix.cxx }}
+
+    steps:
+      - run: echo "🎉 The job was automatically triggered by a ${{ github.event_name }} event."
+      - run: echo "🐧 This job is now running on a ${{ runner.os }} server hosted by GitHub!"
+      - run: echo "🔎 The name of your branch is ${{ github.ref }} and your repository is ${{ github.repository }}."
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - run: echo "💡 The ${{ github.repository }} repository has been cloned to the runner."
+      - run: echo "🖥️ The workflow is now ready to test your code on the runner."
+      - name: List files in the repository
+        run: |
+          ls ${{ github.workspace }}
+      - run: echo "🍏 This job's status is ${{ job.status }}."
+
+      - name: Tool versions
+        run: |
+#          ${CXX} --version
+          cmake --version
+
+      - run: cmake --build . --parallel --config ${{matrix.config}}
+      - run: ctest --parallel 4 --verbose -C ${{matrix.config}}