added job failure expression to workflow

Author: fraisai

.github/workflows/slack-notify.yml

@@ -12,12 +12,12 @@ jobs:
         runs-on: ubuntu-latest
         steps:            
             - name: Slack Notify on Failure
-              if: ${{ success() }}
+              if: ${{ failure() }}
               id: slack
               uses: slackapi/slack-github-action@v1.24.0
               with:
                 channel-id: 'C067F896WG5'
-                slack-message: "Github CI result: ${{ job.status }}\n${{ github.event.pull_request.html_url || github.event.head_commit.url }}"
+                slack-message: "Github CI Result: ${{ job.status }}\n${{ github.event.pull_request.html_url || github.event.head_commit.url }}"
               env:
                 SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}
                 # SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}