Fix failing release notifications GHA (paritytech#3416)

This PR should fix the issue with the failing GHA which sends
notifications to the different matrix channels, when the new release is
published

.github/workflows/release-99_notif-published.yml

@@ -8,13 +8,11 @@ on:
 jobs:
   ping_matrix:
     runs-on: ubuntu-latest
+    environment: release
     strategy:
       matrix:
         channel:
           # Internal
-          - name: 'RelEng: Cumulus Release Coordination'
-            room: '!NAEMyPAHWOiOQHsvus:parity.io'
-            pre-releases: true
           - name: "RelEng: Polkadot Release Coordination"
             room: '!cqAmzdIcbOFwrdrubV:parity.io'
             pre-release: true
@@ -31,18 +29,9 @@ jobs:
             pre-release: true
 
           # Public
-          # - name: '#KusamaValidatorLounge:polkadot.builders'
-          #   room: '!LhjZccBOqFNYKLdmbb:polkadot.builders'
-          #   pre-releases: false
-          # - name: '#kusama-announcements:matrix.parity.io'
-          #   room: '!FMwxpQnYhRCNDRsYGI:matrix.parity.io'
-          #   pre-release: false
-          # - name: '#polkadotvalidatorlounge:web3.foundation'
-          #   room: '!NZrbtteFeqYKCUGQtr:matrix.parity.io'
-          #   pre-release: false
-          # - name: '#polkadot-announcements:matrix.parity.io'
-          #   room: '!UqHPWiCBGZWxrmYBkF:matrix.parity.io'
-          #   pre-release: false
+          - name: '#polkadotvalidatorlounge:web3.foundation'
+            room: '!NZrbtteFeqYKCUGQtr:matrix.parity.io'
+            pre-releases: false
 
     steps:
       - name: Matrix notification to ${{ matrix.channel.name }}