build: Add CMake build

.github/workflows/cmake.yml

@@ -0,0 +1,90 @@
+# inspired by "build GDAL library and to run test with CMake"
+# from https://github.com/OSGeo/gdal/blob/master/.github/workflows/cmake_builds.yml
+
+---
+name: CMake
+
+on:
+    push:
+        paths-ignore:
+            - 'doc/**'
+        branches:
+            - main
+            - releasebranch_*
+    pull_request:
+        paths-ignore:
+            - 'doc/**'
+
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
+env:
+    CMAKE_UNITY_BUILD: OFF
+
+permissions:
+    contents: read  #  to fetch code (actions/checkout)
+
+jobs:
+
+    build-cmake:
+        runs-on: ubuntu-22.04
+        env:
+            PythonVersion: 3.9
+        steps:
+            - name: Checkout GRASS
+              uses: actions/[email protected]
+            - name: Set up Python
+              uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
+              with:
+                  python-version: ${{ env.PythonVersion }}
+            - name: Install CMake 3.16.0
+              run: |
+                cd ${GITHUB_WORKSPACE}
+                wget https://github.com/Kitware/CMake/releases/download/v3.16.0/cmake-3.16.0-Linux-x86_64.tar.gz
+                tar xzf cmake-3.16.0-Linux-x86_64.tar.gz
+                echo "CMAKE_DIR=$GITHUB_WORKSPACE/cmake-3.16.0-Linux-x86_64/bin" >> $GITHUB_ENV
+                echo "$GITHUB_WORKSPACE/cmake-3.16.0-Linux-x86_64/bin" >> $GITHUB_PATH
+            - run: |
+                cmake --version
+            - name: Install dependencies
+              run: |
+                sudo apt-get update -y
+                sudo apt-get install -y wget git gawk findutils
+                xargs -a <(awk '! /^ *(#|$)/' ".github/workflows/apt.txt") -r -- \
+                    sudo apt-get install -y --no-install-recommends --no-install-suggests
+            - run: python -m pip install ninja
+              working-directory: ${{ github.workspace }}
+            - name: Print build environment variables
+              shell: bash -el {0}
+              run: |
+                printenv | sort
+                gcc --version
+                ldd --version
+            - name: Create installation directory
+              run: |
+                mkdir $HOME/install
+            - name: Configure
+              run: |
+                cmake ${CMAKE_OPTIONS} -S $GITHUB_WORKSPACE -B $GITHUB_WORKSPACE/build -G Ninja \
+                  -DCMAKE_INSTALL_PREFIX=$HOME/install -DWITH_NLS=OFF
+            - name: Print CMakeCache.txt
+              shell: bash -el {0}
+              run: |
+                cat ${GITHUB_WORKSPACE}/build/CMakeCache.txt
+            - name: Build
+              run: |
+                cmake --build build --verbose -j$(nproc)
+            - name: Install
+              run: |
+                cmake --install $GITHUB_WORKSPACE/build --verbose
+            - name: Add the bin directory to PATH
+              run: |
+                echo "$HOME/install/bin" >> $GITHUB_PATH
+            - name: Print installed versions
+              if: always()
+              run: .github/workflows/print_versions.sh
+            - name: Test executing of the grass command
+              run: .github/workflows/test_simple.sh
+            - name: Run tests
+              run: .github/workflows/test_thorough.sh --config .gunittest.cfg