Update android template to default branch

changelogs/unreleased/update-ci-template-default-branch-5.yml

+---
+title: Update android template to default branch
+merge_request: 56738
+author:
+type: other

lib/gitlab/ci/templates/Android-Fastlane.gitlab-ci.yml

@@ -113,9 +113,10 @@ promoteBeta:
 promoteProduction:
   extends: .promote_job
   stage: production
-  # We only allow production promotion on `master` because
-  # it has its own production scoped secret variables
+  # We only allow production promotion on the default branch because
+  # it has its own production scoped secret variables.
   only:
-    - master
+    variables:
+      - $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
   script:
     - bundle exec fastlane promote_beta_to_production