Add Slack notification of CI errors (#11421)

* Update links.yml

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Update links

* Update links

---------

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

.github/workflows/ci-testing.yml

@@ -45,6 +45,14 @@ jobs:
           python detect.py --weights ${{ matrix.model }}.onnx --img 320
           python segment/predict.py --weights ${{ matrix.model }}-seg.onnx --img 320
           python classify/predict.py --weights ${{ matrix.model }}-cls.onnx --img 224
+      - name: Notify on failure
+        if: failure() && github.repository == 'ultralytics/yolov5' && (github.event_name == 'schedule' || github.event_name == 'push')
+        uses: slackapi/slack-github-action@v1.23.0
+        with:
+          payload: |
+            {"text": "<!channel> GitHub Actions error for ${{ github.workflow }} ❌\n\n\n*Repository:* https://github.com/${{ github.repository }}\n*Action:* https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}\n*Author:* ${{ github.actor }}\n*Event:* ${{ github.event_name }}\n*Job Status:* ${{ job.status }}\n"}
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL_YOLO }}
 
   Tests:
     timeout-minutes: 60
@@ -151,3 +159,11 @@ jobs:
           for path in '$m', '$b':
               model = torch.hub.load('.', 'custom', path=path, source='local')
           EOF
+      - name: Notify on failure
+        if: failure() && github.repository == 'ultralytics/yolov5' && (github.event_name == 'schedule' || github.event_name == 'push')
+        uses: slackapi/slack-github-action@v1.23.0
+        with:
+          payload: |
+            {"text": "<!channel> GitHub Actions error for ${{ github.workflow }} ❌\n\n\n*Repository:* https://github.com/${{ github.repository }}\n*Action:* https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}\n*Author:* ${{ github.actor }}\n*Event:* ${{ github.event_name }}\n*Job Status:* ${{ job.status }}\n"}
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL_YOLO }}