Enable workflow for PRs with "push" label

- Add pull_request trigger for labeled, synchronize, and opened events
- Add conditional check to only run workflow for pushes to main, workflow_dispatch, or PRs with "push" label
- Maintains existing functionality while enabling selective PR builds

Co-authored-by: solsson <[email protected]>

Author: Copilot

.github/workflows/images.yaml

@@ -4,6 +4,8 @@ on:
   push:
     branches:
     - main
+  pull_request:
+    types: [labeled, synchronize, opened]
   workflow_dispatch:
     inputs:
       force_rebuild:
@@ -16,6 +18,7 @@ jobs:
   publish:
     name: Publish
     runs-on: ubuntu-latest
+    if: github.event_name == 'push' || github.event_name == 'workflow_dispatch' || (github.event_name == 'pull_request' && contains(github.event.pull_request.labels.*.name, 'push'))
     permissions:
       packages: write
       contents: read