Fix github actions on push (again)

Author: LucaRom

.github/workflows/github-actions-ci.yml

@@ -20,6 +20,8 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install -r requirements.txt
+          # install project in editable mode + dev extras (quotes are important!)
+          pip install -e ".[dev]"
 
       - name: Run tests
         run: pytest tests/