Add Github action workflow

.github/workflows/ci.yml

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+# This file is part of CMake-codecov.
+#
+# Copyright (c)
+#   2015-2020 RWTH Aachen University, Federal Republic of Germany
+#
+# See the LICENSE file in the package base directory for details
+#
+# Written by Alexander Haase, alexander.haase@rwth-aachen.de
+#
+
+name: CMake-codecov CI
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        cmake_version: [4.0.1, 3.31.7, 3.28.6, 3.26.6, 3.21.7, 3.20.6, 3.16.9, 3.12.4, 3.10.3]
+        compiler: [gcc, clang]
+        generator: [Ninja, Unix Makefiles]
+        os: [ubuntu-24.04]
+        # CMake-Codecov relies on compiling with absolute paths, but CMake uses absolute paths 
+        # with Ninja only starting with 3.21, so exclude older (non-supported) versions
+        exclude:
+          - cmake_version: 3.20.6
+            generator: Ninja
+          - cmake_version: 3.16.9
+            generator: Ninja
+          - cmake_version: 3.12.4
+            generator: Ninja
+          - cmake_version: 3.10.3
+            generator: Ninja
+        # Additionally test Ubuntu and macOS with default packages
+        include:
+          - os: ubuntu-22.04
+            cmake_version: default
+            generator: Unix Makefiles
+            compiler: gcc
+          - os: ubuntu-22.04
+            cmake_version: default
+            generator: Unix Makefiles
+            compiler: clang
+          - os: ubuntu-22.04
+            cmake_version: default
+            generator: Ninja
+            compiler: gcc
+          - os: ubuntu-22.04
+            cmake_version: default
+            generator: Ninja
+            compiler: clang
+          - os: macos-latest
+            compiler: clang
+            cmake_version: default
+            generator: Unix Makefiles
+          - os: macos-latest
+            compiler: clang
+            cmake_version: default
+            generator: Ninja
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install lcov, compilers on Linux
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y lcov gfortran ${{ matrix.compiler }}
+
+      - name: Install default CMake
+        if: runner.os == 'Linux' && matrix.cmake_version == 'default'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y cmake
+
+      - name: Install specific CMake version
+        if: runner.os == 'Linux' && matrix.cmake_version != 'default'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y wget
+          wget https://github.com/Kitware/CMake/releases/download/v${{ matrix.cmake_version }}/cmake-${{ matrix.cmake_version }}-linux-x86_64.tar.gz
+          tar -xzf cmake-${{ matrix.cmake_version }}-linux-x86_64.tar.gz --strip-components=1 -C cmake
+          sudo cp -r cmake/* /usr/local/
+
+      - name: Install CMake, lcov on macOS
+        if: runner.os == 'macOS'
+        run: |
+          brew update
+          brew install cmake lcov
+
+      - name: Print CMake version
+        run: cmake --version
+
+      - name: Configure and build
+        run: |
+          mkdir build && cd build
+          cmake .. -DCMAKE_C_COMPILER="${{ matrix.compiler }}" -G "${{ matrix.generator }}" -DENABLE_COVERAGE=On
+          cmake --build .
+          cmake --build . --target test
+          cmake --build . --target gcov
+          cmake --build . --target lcov
+
+      # - name: Codecov upload
+      #   uses: codecov/codecov-action@v5
+      #   with:
+      #     name: codecov-coverage
+      #     token: ${{ secrets.CODECOV_TOKEN }}
+      #     fail_ci_if_error: true