remove unneeded workflow triggers

.github/workflows/docker.yml

@@ -17,9 +17,7 @@ on:
   # See: https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#pull_request
   pull_request:
     types:
-      - labeled
       - opened
-      - ready_for_review
       - reopened
       - synchronize