feat(resolver): Support for User-Defined Runners (#8216)

Co-authored-by: Victor Faro <victor.faro@mcmakler.de>
Co-authored-by: Rohit Malhotra <rohitvinodmalhotra@gmail.com>

.github/workflows/openhands-resolver.yml

@@ -34,6 +34,10 @@ on:
         type: string
         default: ""
         description: "Custom sandbox env"
+      runner:
+        required: false
+        type: string
+        default: "ubuntu-latest"
     secrets:
       LLM_MODEL:
         required: false
@@ -79,7 +83,7 @@ jobs:
         (github.event.review.author_association == 'OWNER' || github.event.review.author_association == 'COLLABORATOR' || github.event.review.author_association == 'MEMBER')
         )
       )
-    runs-on: ubuntu-latest
+    runs-on: "${{ inputs.runner }}"
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4