ci: add a ping when sweepers are failing (#4574)

Co-authored-by: devtools-ci-cd <[email protected]>

Author: remyleone

.github/workflows/nightly.yml

@@ -107,3 +107,21 @@ jobs:
           SCW_SECRET_KEY: ${{ secrets.SCW_SECRET_KEY }}
           SCW_DEFAULT_ORGANIZATION_ID: ${{ secrets.SCW_DEFAULT_ORGANIZATION_ID }}
           SCW_DEFAULT_PROJECT_ID: ${{ secrets.SCW_DEFAULT_PROJECT_ID }}
+      - name: Ping on failure
+        if: ${{ failure() }}
+        run: |
+          curl -X POST -H 'Content-type: application/json' \
+          --data '{
+          	"blocks": [
+              {
+                "type": "section",
+                "text": {
+                    "type": "mrkdwn",
+                    "text": "'"Scaleway CLI sweepers in Nightly workflow failed: <https://github.com/scaleway/scaleway-cli/actions/runs/${GITHUB_RUN_ID}>"'"
+                  }
+              }
+            ]
+          }' \
+          ${SLACK_WEBHOOK_NIGHTLY};
+        env:
+          SLACK_WEBHOOK_NIGHTLY: ${{ secrets.SLACK_WEBHOOK_NIGHTLY }}