update binder environment and include it in github action tests (#93)

* update binder environment and include it in github action tests

* binder test: set REPO_DIR

.binder/environment.yml

@@ -2,9 +2,9 @@ name: fabm
 channels:
   - conda-forge
 dependencies:
-  - python=3.8
+  - python
   - pip
-  - fortran-compiler
+  - gfortran
   - cmake
   - jupyterlab
   - numpy

.github/workflows/fabm.yml

@@ -372,3 +372,24 @@ jobs:
         run: |
           cmake -S . -B build -G Ninja
           cmake --build build --target install
+  binder:
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.repository
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash -el {0}
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+      - name: Set up Python with conda
+        uses: conda-incubator/setup-miniconda@v3
+        with:
+          auto-update-conda: true
+          environment-file: .binder/environment.yml
+          activate-environment: fabm
+      - name: Install
+        run: .binder/postBuild
+        env:
+          REPO_DIR: .