Added the slack notifications (#14)

* Added the slack notifications

* Update release.yml

* Update release.yml

* Removed the success notification from homebrew added in CLI

.github/workflows/release.yml

@@ -38,3 +38,20 @@ jobs:
           tag: ${{github.event.inputs.version}}
           token: ${{ secrets.GITHUB_TOKEN }}
           prerelease: ${{github.event.inputs.pre-release}}
+    notify-complete-fail:
+      if: ${{ failure() || cancelled() }}
+      needs: [ release ]
+      name: Notify Release Failed
+      runs-on: ubuntu-latest
+      steps:
+        - uses: actions/checkout@v2
+        - name: Slack Notification
+          uses: rtCamp/action-slack-notify@v2
+          env:
+            SLACK_WEBHOOK: ${{ secrets.ALERT_SLACK_WEB_HOOK }}
+            SLACK_COLOR: "#ff3333"
+            SLACK_USERNAME: CLI Release Bot
+            SLACK_ICON_EMOJI: ":ship:"
+            SLACK_TITLE: "Twilio Cli"
+            SLACK_MESSAGE: 'Homebrew Release Failed'
+            MSG_MINIMAL: actions url