ci url output had trailing spaces, which fails yaml linting

Jira: IAM-950

Author: bheesham

tools/lint-apps

@@ -4,6 +4,7 @@
 #
 # Adapted from mozilla-iam/iam to run in CI.
 import os
+import re
 from typing import Any
 
 from auth0.authentication import GetToken  # type: ignore
@@ -24,10 +25,15 @@ def apps_from_yml(filename) -> Any:
         return yaml.load(handle)
 
 
+def no_trailing_spaces_for_urls(line: str) -> str:
+    """We'll fail pre-commit's yaml linting otherwise."""
+    return line.replace("  url: \n", "  url:\n")
+
+
 def apps_to_yml(apps: Any) -> None:
     yaml = YAML(typ="rt")
     with open(APPS_NEW_YML, "w") as handle:
-        yaml.dump(apps, handle)
+        yaml.dump(apps, handle, transform=no_trailing_spaces_for_urls)
 
 
 def apps_from_auth0():