ci: fix postgres hostname for docker service networking

.gitea/workflows/ci.yaml

@@ -31,7 +31,7 @@ jobs:
       run:
         working-directory: memento-note
     env:
-      DATABASE_URL: "postgresql://memento_test:memento_test@localhost:5432/memento_test"
+      DATABASE_URL: "postgresql://memento_test:memento_test@postgres:5432/memento_test"
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -51,8 +51,9 @@ jobs:
 
       - name: Setup test database
         run: |
+          apt-get update && apt-get install -y postgresql-client
+          PGPASSWORD=memento_test psql -h postgres -U memento_test -d memento_test -c "CREATE EXTENSION IF NOT EXISTS vector;"
           npx prisma migrate deploy
-          PGPASSWORD=memento_test psql -h localhost -U memento_test -d memento_test -c "CREATE EXTENSION IF NOT EXISTS vector;"
 
       - name: Lint
         run: npm run lint