Fix failing rc-automation GHA (#2648)

This PR adds missing `environment: release` parameter to the
`rc-automation ` GHA

Author: EgorPopelyaev

.github/workflows/release-10_rc-automation.yml

@@ -17,6 +17,7 @@ jobs:
         channel:
           - name: "RelEng: Polkadot Release Coordination"
             room: '!cqAmzdIcbOFwrdrubV:parity.io'
+    environment: release
 
     steps:
       - name: Checkout sources