Install requirements on tests

.github/workflows/test.yml

@@ -49,6 +49,7 @@ jobs:
     - uses: actions/checkout@v2
     - name: Install requirements
       run: |
+        pip install -r requirements.txt
         pip install -r dev-requirements.txt
         pip install -e .
         # Replace default path to CKAN core config file with the one on the container