Merge branch 'debdolph-master-patch-72145' into 'master'

Add staging environment

See merge request schul-frei/schul-frei.org!14

.gitlab-ci.yml

@@ -9,8 +9,24 @@ pages:
   - pip install Markdown gitpython pelican py_w3c beautifulsoup4
   script:
   - make publish
+  environment:
+    production
   artifacts:
     paths:
     - public/
   only:
   - master
+
+pages_staging:
+  stage: test
+  before_script:
+  - pip install Markdown gitpython pelican py_w3c beautifulsoup4
+  script:
+  - make publish
+  environment:
+    staging
+  artifacts:
+    paths:
+    - public/
+  only:
+  - merge_requests