feat: added slack notification for nightly scan failure

Signed-off-by: Ved Ratan <[email protected]>

.github/workflows/nightly-scan.yaml

@@ -88,3 +88,15 @@ jobs:
           echo "====grype-scan===="
           cat ${{ steps.grype-scan.outputs.sarif }}
           exit 1  
+
+      - name: Notify failure status
+        if: always() && (job.status == 'failure')
+        uses: rtCamp/action-slack-notify@c33737706dea87cd7784c687dadc9adf1be59990 #v2.3.2
+        env:
+          SLACK_CHANNEL: cve-nightly-scan-alerts
+          SLACK_COLOR: ${{ job.status }}
+          SLACK_ICON: https://cdn-icons-png.flaticon.com/512/25/25231.png
+          SLACK_MESSAGE: Repository - ${{github.repository}} - ${{ steps.extract_branch.outputs.branch }} Environment - nightly-scan
+          SLACK_TITLE: CVE discovered
+          SLACK_USERNAME: Github Actions
+          SLACK_WEBHOOK: https://hooks.slack.com/services/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