👷 [open-zaak/open-zaak#1649] Job to check if docs changed

Author: stevenbal

.github/workflows/ci.yml

@@ -102,6 +102,31 @@ jobs:
       - name: Publish coverage report
         uses: codecov/codecov-action@v3
 
+  docs:
+    runs-on: ubuntu-latest
+    name: Documentation build
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+          cache: 'pip'
+          cache-dependency-path: 'requirements/*.txt'
+      - name: Install dependencies
+        run: pip install -r requirements/ci.txt pytest
+      - name: Generate environment variable documentation using OAf and check if it was updated
+        run: |
+          python src/manage.py generate_envvar_docs --file docs/installation/config.rst --exclude-group Celery
+          changes=$(git diff docs/installation/config.rst)
+          if [ ! -z "$changes" ]; then
+              echo $changes
+              echo "Please update the environment documentation by running \`python src/manage.py generate_envvar_docs --file docs/installation/config.rst --exclude-group Celery\`"
+              exit 1
+          fi
+        env:
+          DJANGO_SETTINGS_MODULE: openklant.conf.ci
+
   docker:
     needs: tests
     name: Build Docker image