ci: build custom image on github-hosted runner (unblock queued build) - #19

Bugbot Analysis Progress (2m 28s elapsed)

✅ Gathered PR context (7s)
✅ Completed bug detection (2m 21s)
✅ Posted analysis results (0s)

Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_8f1fa49a-87f1-4174-a96f-49913c7fb8b2