chore(ci): remove temporary runner label check

.forgejo/workflows/_runner_ping.yml

@@ -1,20 +0,0 @@
-name: runner-ping
-
-on:
-  push:
-    branches: [dev]
-
-jobs:
-  ping:
-    runs-on: omhk-deploy
-    steps:
-      - name: Ping runner
-        run: |
-          set -euo pipefail
-          echo "=== omhk-deploy OK ==="
-          hostname
-          echo "rsync: $(command -v rsync || echo MISSING)"
-          echo "ssh:   $(command -v ssh || echo MISSING)"
-          echo "curl:  $(command -v curl || echo MISSING)"
-          echo "docker:$(command -v docker || echo MISSING)"
-        shell: bash