Set PGSERVICE environment variable in the test job

.github/workflows/test.yml

@@ -72,6 +72,8 @@ jobs:
         run: |
           pip install pytest pytest-sugar pytest-cov coverage
           pytest tests/
+        env:
+          PGSERVICE: ${{ steps.postgres.outputs.service-name }}
 
       - name: Upload coverage reports to Codecov
         uses: codecov/codecov-action@v3