Change hardcoded master to $defaultBranch

Since we pass over the defaultBranch argument in our templates, this seems to break because of the hardcoded master values. Probably this affects other providers as well.

Signed-off-by: Simon Stamm <simon.stamm@tui.com>

plugins/scaffolder-backend/src/scaffolder/actions/builtin/publish/gitlab.ts

@@ -127,7 +127,7 @@ export function createPublishGitlabAction(options: {
       });
 
       const remoteUrl = (http_url_to_repo as string).replace(/\.git$/, '');
-      const repoContentsUrl = `${remoteUrl}/-/blob/master`;
+      const repoContentsUrl = `${remoteUrl}/-/blob/${defaultBranch}`;
 
       const gitAuthorInfo = {
         name: config.getOptionalString('scaffolder.defaultAuthor.name'),