ci: target Incredibuild runners for Bazel monitor

Use the Incredibuild self-hosted runner label explicitly and document it for local workflow linting.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: zozo123

.github/actionlint.yaml

@@ -0,0 +1,3 @@
+self-hosted-runner:
+  labels:
+    - Incredibuild

.github/workflows/incredibuild-bazel-monitor.yml

@@ -46,8 +46,8 @@ jobs:
   bazel-monitor:
     name: Bazel monitor on Incredibuild
     runs-on:
-      group: Incredibuild
-      labels: ubuntu-latest
+      - self-hosted
+      - Incredibuild
 
     steps:
       - name: Initialize environment