add deploy key

.github/workflows/hotfix-release-branches.yml

@@ -32,9 +32,12 @@ jobs:
     # use a lower powered instance since this just does i/o to docker hub
     runs-on: [runs-on,runner=2cpu-linux-x64,"run-id=${{ github.run_id }}"]
     steps:
+    
+      # needs RKUO_DEPLOY_KEY for write access to merge PR's
       - name: Checkout Repository
         uses: actions/checkout@v4
         with:
+          ssh-key: "${{ secrets.RKUO_DEPLOY_KEY }}"
           fetch-depth: 0
           
       - name: Set up Git user