fix(ci): use bash /dev/tcp for postgres readiness check

.gitea/workflows/test.yml

@@ -55,7 +55,7 @@ jobs:
 
       - name: Wait for postgres
         run: |
-          until nc -z localhost 5432; do
+          until bash -c 'echo > /dev/tcp/localhost/5432' 2>/dev/null; do
             echo "Waiting for postgres..."
             sleep 2
           done