fix: Improve database connection retry logic with detailed error messages

.gitea/actions/setup-python-env/action.yml

@@ -139,11 +139,16 @@ runs:
             f"port={os.environ['DATABASE_PORT']}"
         )
 
-        for attempt in range(30):
+        max_attempts = 30
+        for attempt in range(max_attempts):
           try:
             with psycopg2.connect(dsn):
               break
-            except psycopg2.OperationalError:
+          except psycopg2.OperationalError as exc:
+            print(
+              f"Attempt {attempt + 1}/{max_attempts} failed to connect to Postgres: {exc}",
+              flush=True,
+            )
             time.sleep(2)
         else:
             raise SystemExit("Postgres service did not become available")