fix docker-verify-refreshed-at-updated workflow

Add pull-requests: read permission and remove incorrectly named
verify-dockerfile-refreshed-at-updated.yaml workflow file.

Author: kernelsam

…ify-dockerfile-refreshed-at-updated.yaml …/docker-verify-refreshed-at-updated.yaml.github/workflows/verify-dockerfile-refreshed-at-updated.yaml renamed to .github/workflows/docker-verify-refreshed-at-updated.yaml .github/workflows/verify-dockerfile-refreshed-at-updated.yaml renamed to .github/workflows/docker-verify-refreshed-at-updated.yaml

@@ -1,7 +1,12 @@
-name: Verify Dockerfile REFRESHED_AT Updated
+name: Docker verify REFRESHED_AT Updated
 
 on:
   pull_request:
+    branches: [main]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.ref_name }}
+  cancel-in-progress: true
 
 permissions: {}