fix: revert test.yaml to ubuntu-latest (no self-hosted runners in this repo)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: samuelho-dev

.github/workflows/test.yaml

@@ -15,7 +15,7 @@ on:
 jobs:
   test-workflow-outputs:
     name: Test Docker Workflow Outputs
-    runs-on: homelab-runners
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4