upgrade postgres, add env vars

Author: mwvolo

.github/workflows/tests.yml

@@ -15,12 +15,14 @@ jobs:
 
     services:
       postgres:
-        image: postgres:13
+        image: postgres:16
         ports:
           - 5432:5432
         options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
         env:
+          POSTGRES_USER: postgres
           POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: oscms_test
 
     steps:
     - uses: actions/checkout@v4