Fix --validate-config exit code (#24398)

Validate config exists 0 regardless of if the config is valid or not.
This makes it not very useful for CI

Tiny fix to bail non-zero if the config is invalid

frigate/__main__.py

@@ -99,6 +99,10 @@ def main() -> None:
         print("***    End Config Validation Errors                       ***")
         print("*************************************************************")
 
+        # force a non-zero exit code for config failures
+        if args.validate_config:
+            sys.exit(1)
+
         # attempt to start Frigate in recovery mode
         try:
             config = FrigateConfig.load(install=True, safe_load=True)