chore: label PRs after discovery creates them (#1886)

Add PR labeling step to the update-plugins-repo-refs workflow so that
newly created PRs get labeled immediately after discovery, rather than
waiting for the daily scheduled label run.

Assisted-by: Cursor

Signed-off-by: David Festal <dfestal@redhat.com>

Author: davidfestal

.github/workflows/label-mandatory-workspace-prs.yaml

@@ -4,6 +4,7 @@ on:
   schedule:
     - cron: '0 6 * * *'  # Daily at 6:00 AM UTC
   workflow_dispatch:  # Allow manual triggering
+  workflow_call:  # Allow calling from other workflows
 
 concurrency:
   group: ${{ github.workflow }}

.github/workflows/update-plugins-repo-refs.yaml

@@ -206,3 +206,17 @@ jobs:
     permissions:
       contents: write
       pull-requests: write
+
+  label-prs:
+    name: Label PRs
+    needs: [update-branches, update-release-branches, update-main-branch]
+    if: |
+      always() && 
+      (needs.update-branches.result != 'skipped' || 
+       needs.update-release-branches.result != 'skipped' || 
+       needs.update-main-branch.result != 'skipped')
+    uses: ./.github/workflows/label-mandatory-workspace-prs.yaml
+    permissions:
+      contents: read
+      pull-requests: write
+      issues: read