Install rustc and cargo to compile opening-hours extension

.gitlab-ci.yml

@@ -9,6 +9,7 @@ Run tests:
   stage: test
   image: python:3.9-bullseye
   before_script:
+    - apt update -y && apt install -y rustc # for "opening-hours" extension
     - pip install pytest
     - pip install -r requirements.txt
     - pip install --editable .
@@ -21,6 +22,7 @@ Publish on PyPI:
   only:
     - tags
   before_script:
+    - apt update -y && apt install -y rustc cargo # for "opening-hours" extension
     - pip install twine
     - python setup.py sdist bdist_wheel
   variables: