ci: Ignore Slack notification error (#584)

Author: manchuck

.github/workflows/publish.yml

@@ -40,8 +40,10 @@ jobs:
       matrix:
         url: [SLACK_WEBHOOK_ASK_DEVREL_URL, SLACK_WEBHOOK_DEVREL_TOOLING_URL, SLACK_WEBHOOK_DEVREL_PRIVATE_URL]
     steps:
-      - name: Send to Slack channels
+      - name: Send to slack channels
         uses: slackapi/slack-github-action@v2.0.0
+        if: always();
+        continue-on-error: true
         with:
           webhook: ${{ secrets[matrix.url] }}
           webhook-type: incoming-webhook