Fix port mapping

Author: stephen-riggs

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
           POSTGRES_PASSWORD: psql_pwd
           POSTGRES_USER: psql_user
         ports:
-          5432: 5432
+          - 5432:5432
         options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
 
     steps: