Fix container image path

Author: antamel

.github/workflows/test.yml

@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
     runs-on: ubuntu-latest
     container:
-      image: ${{ format('ghcr.io/postgres-dev/{0}:1.0', matrix.os) }}
+      image: postgres:${{ matrix.pg_version }}
       options: --privileged
       env:
         PGDATA: $HOME/data