use correct container for checking database

.github/workflows/deploy-to-staging.yml

@@ -68,7 +68,7 @@ jobs:
           docker compose up -d
 
           # Wait for PostgreSQL to be ready
-          until docker compose exec store pg_isready; do sleep 5; done
+          until docker compose exec store_pgsql pg_isready; do sleep 5; done
 
           docker compose exec store flask db migrate
           docker compose exec store flask db upgrade
@@ -84,7 +84,7 @@ jobs:
           docker compose up -d
 
           # Wait for PostgreSQL to be ready
-          until docker compose exec compose pg_isready; do sleep 5; done
+          until docker compose exec compose_pgsql pg_isready; do sleep 5; done
 
           docker compose exec compose flask db migrate
           docker compose exec compose flask db upgrade