CI: Only run branch tests on Renovate branches where it's needed (#2899)

Follow-up to 936e72b -- prevent unnecessary test runs in Renovate branches.

Currently only "lock file maintenace" has automerge enabled, other Renovate branches will use PR tests not branch tests.

Author: intgr

.github/workflows/test.yml

@@ -4,7 +4,8 @@ on:
   push:
     branches:
       - master
-      - "renovate/**"
+      # Renovate "automerge" branches -- there is no PR, so branch tests are used instead
+      - "renovate/lock-file-maintenance"
   pull_request:
   workflow_dispatch: