Change permissions on workflow

Author: MoteHue

.github/workflows/overcloud-host-image-build.yml

@@ -48,7 +48,9 @@ jobs:
     runs-on: ${{ needs.runner-selection.outputs.runner_name_image_build }}
     needs:
       - runner-selection
-    permissions: write-all
+    permissions:
+      contents: write
+      pull-requests: write
     steps:
       - name: Validate inputs
         run: |