Fix init file path

Author: tuhaihe

.github/workflows/binary-swap-check.yml

@@ -638,7 +638,7 @@ jobs:
             # Check for critical test directories
             ls -ld \${SRC_DIR}/src/test/regress/sql || echo \"ERROR: sql dir missing\"
             
-            ./pg_regress --dbname=regression --host=localhost --port=7000 --init-file=src/test/regress/init_file char varchar boolean || echo \"WARNING: Population finished with some output differences (check logs below if needed)\"
+            ./pg_regress --dbname=regression --host=localhost --port=7000 --init-file=init_file char varchar boolean || echo \"WARNING: Population finished with some output differences (check logs below if needed)\"
             cat regression.diffs 2>/dev/null || true
             
             # 5. Run the actual binary swap test script