add a dry-run to auditupdate CLI

tools/auditupdate/auditupdate/cli.py

@@ -83,6 +83,9 @@ def main():
     parser.add_argument('-n', '--output-topic-title',
                         help='Title of the topic to append unreferenced patches to',
                         default='Uncategorized Patches')
+    parser.add_argument('-d', '--dry-run',
+                        help='Do not commit or push changes to the repository',
+                        default=False, action='store_true')
     parser.add_argument('audit_config_dir',
                          help='the audit directory to be updated')
 
@@ -130,6 +133,10 @@ def main():
         logging.critical(f"Upstream repo was updated (from {old_target[0:7]} to {new_target[0:7]}) but didn't find new patches. Something is wrong here!")
         return 1
 
+    if args.dry_run:
+        logging.info(f"DRY-RUN: Not committing or pushing changes to the repository.")
+        return 0
+
     # Commit and push the new (uncategorized) patch references.
     run_git(["add", audit.get_topic_file_path(args.output_topic)])
     run_git(["commit", "--no-gpg-sign", "-m", f"Automatic update to match patches until {new_target[0:7]}"])