Wait for postgres server before starting unit tests

Author: manisandro

.github/workflows/main.yml

@@ -39,6 +39,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           python -m pip install -r requirements.txt
+          until PGSERVICEFILE=$PWD/qwc-docker/pg_service_local.conf psql service=qwc_configdb -c "select 1" > /dev/null 2>&1; do echo "Waiting for postgres server..."; sleep 1; done
           PGSERVICEFILE=$PWD/qwc-docker/pg_service_local.conf PYTHONPATH=$PWD/src python3 test.py
 
       - name: Validate schema