Use linux.large.arc for stale workflow (pytorch#115440)

* Try linux.large.arc for stale workflow

* Run stale workflow on PR changes

* Added arc runner lable to the list of self hosted runners

* Added concurency linux-job

* Cleanup

* Added workflow_dispatch for testing purpose

.github/actionlint.yaml

@@ -3,6 +3,7 @@ self-hosted-runner:
     - linux.20_04.4x
     - linux.20_04.16x
     - linux.large
+    - linux.large.arc
     - linux.2xlarge
     - linux.4xlarge
     - linux.12xlarge

.github/workflows/stale.yml

@@ -16,11 +16,12 @@ on:
   schedule:
     # Run hourly.
     - cron: 30 * * * *
+  workflow_dispatch:
 
 jobs:
   stale:
     if: ${{ github.repository == 'pytorch/pytorch' }}
-    runs-on: ubuntu-latest
+    runs-on: linux.large.arc
 
     steps:
       - uses: actions/github-script@v6