Added gotm workflow (WIP)

.github/workflows/gotm.yaml

+name: Build and test
+on: push
+jobs:
+  gfortran:
+    strategy:
+      matrix:
+        version: [14]
+        os: ["ubuntu-latest"]
+        include:
+          - version: 14
+            os: ubuntu-24.04
+      fail-fast: false
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Install compiler
+        run: |
+          sudo apt-get update
+          sudo apt-get install gfortran-${{ matrix.version }}
+      - name: Clone gotm (including fabm)
+        uses: actions/checkout@v4
+        with:
+          repository: gotm-model/code
+          path: gotm
+          submodules: recursive
+
+      - name: Clone fabm-oxypom
+        uses: actions/checkout@v4
+        with:
+          path: fabm-oxypom
+
+      - name: Build gotm with fabm and oxypom
+        run: |
+          cmake -B gotm/build -S gotm/src -DCMAKE_Fortran_COMPILER=${{ matrix.f_compiler }}  -DGOTM_USE_FABM=ON -DGOTM_USE_NetCDF=OFF ${{ matrix.cmake_args }}
+  conda-forge:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
+    defaults:
+      run:
+        shell: bash -el {0}
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: conda-incubator/setup-miniconda@v3
+        with:
+          auto-update-conda: true
+      - name: Clone gotm
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+          repository: gotm-model/code
+      - name: Install conda packages (Linux, Mac)
+        if: matrix.os != 'windows-latest'
+        run: conda install -c conda-forge fortran-compiler netcdf-fortran
+      - name: Install conda packages (Windows)
+        if: matrix.os == 'windows-latest'
+        run: |
+          conda install -c conda-forge m2w64-gcc-fortran m2w64-make netcdf-fortran
+          echo "CMAKE_GENERATOR=MinGW Makefiles" >> "$GITHUB_ENV"
+      - name: build
+        run: |
+          cmake -B build -S . -DGOTM_USE_STIM=ON -DGOTM_USE_SEAGRASS=ON -DCMAKE_BUILD_TYPE=Release
+          cmake --build build --config Release