feat(catalog-import): make catalog import branch name customizable

Signed-off-by: Mikko Korhonen <mikko.korhonen@gmail.com>

plugins/catalog-import/config.d.ts

@@ -28,6 +28,13 @@ export interface Config {
        * @visibility frontend
        */
       entityFilename?: string;
+      /**
+       * A branch name used in pull request when registering existing component via UI
+       * Valid git refname required, see: https://git-scm.com/docs/git-check-ref-format
+       * Defaults to "backstage-integration"
+       * @visibility frontend
+       */
+      pullRequestBranchName?: string;
     };
   };
 }

plugins/catalog-import/src/api/CatalogImportClient.ts

@@ -303,7 +303,9 @@ the component will become available.\n\nFor more information, read an \
       baseUrl: githubIntegrationConfig.apiBaseUrl,
     });
 
-    const branchName = 'backstage-integration';
+    const branchName =
+      this.configApi.getOptionalString('catalog.pullRequestBranchName') ??
+      'backstage-integration';
     const fileName =
       this.configApi.getOptionalString('catalog.import.entityFilename') ??
       'catalog-info.yaml';