ci: Add GitHub Actions based workflow

.github/workflows/CI.yml

@@ -0,0 +1,51 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+    paths-ignore:
+      - "**.rst"
+      - "Docs/**"
+  pull_request:
+    paths-ignore:
+      - "**.rst"
+      - "Docs/**"
+
+jobs:
+  tests:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      max-parallel: 3
+      matrix:
+        os: [ubuntu-20.04]
+        # 3.4.x: Excluded because of "error while loading shared libraries: libidn.so.11: cannot open shared object file: No such file or directory"
+        cmake-version: [
+          "2.8.x",
+          "3.0.x", "3.8.x", "3.12.x", "3.14.x",
+          "3.16.x", "3.17.x", "3.18.x", "3.19.x", "3.20.x", "3.21.x",
+          "3.22.x", "3.23.x", "3.24.x", "3.25.x", "3.26.x",
+          "latest"
+          ]
+
+    name: Tests on ${{ matrix.os }} using  ${{ matrix.cmake-version }}
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Setup cmake
+      uses: jwlawson/actions-setup-cmake@v1.14.1
+      with:
+        cmake-version: ${{ matrix.cmake-version }}
+
+    - name: Setup ninja
+      uses: urkle/action-get-ninja@v1
+
+    - name: Configure
+      run: |
+        mkdir ${{github.workspace}}/build && cd $_
+        cmake -DCMAKE_BUILD_TYPE:STRING=Release ${{github.workspace}}/Tests
+
+    - name: Test
+      run: |
+        cd ${{github.workspace}}/build
+        ctest -C Release -V