Announce release in Community Slack (#3124)

Author: lucacome

.github/workflows/ci.yml

@@ -327,6 +327,7 @@ jobs:
           GOPATH: ${{ needs.checks.outputs.go_path }}
           AWS_PRODUCT_CODE: ${{ secrets.AWS_PRODUCT_CODE }}
           AWS_PUB_KEY: ${{ secrets.AWS_PUB_KEY }}
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK_COMMUNITY }}
       - name: Store Artifacts in Cache
         uses: actions/cache@v3
         with:

.goreleaser.yml

@@ -64,3 +64,9 @@ release:
 
 milestones:
   - close: true
+
+announce:
+  slack:
+    enabled: true
+    channel: '#announcements'
+    message_template: 'NGINX Ingress Controller {{ .Tag }} is out! Check it out: {{ .ReleaseURL }}'