Update subscribe-to-mns.yml (#496)

.github/workflows/subscribe-to-mns.yml

@@ -12,22 +12,19 @@ on:
       sandbox:
         required: true
         type: string
-    secrets:
-      AWS_ASSUME_ROLE:
-        required: true
 permissions:
   pull-requests: write
   id-token: write # This is required for requesting the JWT
   contents: read # This is required for actions/checkout
 jobs:
-  batch_update_build_docker_image:
+  placeholder:
     runs-on: ubuntu-latest
     environment: ${{ inputs.environment }}
     defaults:
       run:
         working-directory: lambdas
     steps:
       - name: Placeholder
-    run: |
-      echo "Running placeholder job on ${inputs.sandbox}"
+        run: |
+          echo "Running placeholder job on ${inputs.sandbox}"