feat: add error handling for invalid repo settings configuration

- Implement error handling for invalid TOML configurations in repo settings.
- Log warnings and send comments to PRs when configuration errors occur.
- Introduce `handle_configurations_errors` function to manage error reporting.
- Ensure compatibility with different markdown formats for error messages.

pr_agent/git_providers/utils.py

@@ -27,8 +27,11 @@ def apply_repo_settings(pr_url):
                 except Exception:
                     pass
 
+            error_local = None
             if repo_settings:
                 repo_settings_file = None
+                category = 'local'
+                try:
                     fd, repo_settings_file = tempfile.mkstemp(suffix='.toml')
                     os.write(fd, repo_settings)
                     new_settings = Dynaconf(settings_files=[repo_settings_file])
@@ -39,6 +42,12 @@ def apply_repo_settings(pr_url):
                         get_settings().unset(section)
                         get_settings().set(section, section_dict, merge=False)
                     get_logger().info(f"Applying repo settings:\n{new_settings.as_dict()}")
+                except Exception as e:
+                    get_logger().warning(f"Failed to apply repo {category} settings, error: {str(e)}")
+                    error_local = {'error': str(e), 'settings': repo_settings, 'category': category}
+
+                if error_local:
+                    handle_configurations_errors([error_local], git_provider)
         except Exception as e:
             get_logger().exception("Failed to apply repo settings", e)
         finally:
@@ -53,6 +62,36 @@ def apply_repo_settings(pr_url):
         set_claude_model()
 
 
+def handle_configurations_errors(config_errors, git_provider):
+    try:
+        if not any(config_errors):
+            return
+
+        for err in config_errors:
+            if err:
+                configuration_file_content = err['settings'].decode()
+                err_message = err['error']
+                config_type = err['category']
+                header = f"❌ **PR-Agent failed to apply '{config_type}' repo settings**"
+                body = f"{header}\n\nThe configuration file needs to be a valid [TOML](https://qodo-merge-docs.qodo.ai/usage-guide/configuration_options/), please fix it.\n\n"
+                body += f"___\n\n**Error message:**\n`{err_message}`\n\n"
+                if git_provider.is_supported("gfm_markdown"):
+                    body += f"\n\n<details><summary>Configuration content:</summary>\n\n```toml\n{configuration_file_content}\n```\n\n</details>"
+                else:
+                    body += f"\n\n**Configuration content:**\n\n```toml\n{configuration_file_content}\n```\n\n"
+                get_logger().warning(f"Sending a 'configuration error' comment to the PR", artifact={'body': body})
+                # git_provider.publish_comment(body)
+                if hasattr(git_provider, 'publish_persistent_comment'):
+                    git_provider.publish_persistent_comment(body,
+                                                            initial_header=header,
+                                                            update_header=False,
+                                                            final_update_message=False)
+                else:
+                    git_provider.publish_comment(body)
+    except Exception as e:
+        get_logger().exception(f"Failed to handle configurations errors", e)
+
+
 def set_claude_model():
     """
     set the claude-sonnet-3.5 model easily (even by users), just by stating: --config.model='claude-3-5-sonnet'