Add step that notifies Slack when jobs in the hub deployement workflo…

.github/workflows/deploy-hubs.yaml

@@ -128,6 +128,18 @@ jobs:
             pr-number.txt
             comment-body.txt
 
+      # https://github.com/ravsamhq/notify-slack-action
+      # Needs to be added per job
+      # When https://github.com/integrations/slack/issues/1563 gets implemented,
+      # we can use that instead
+      - name: Report Status
+        if: always()
+        uses: ravsamhq/notify-slack-action@v2
+        with:
+          notify_when: "failure"
+          status: ${{ job.status }} # required
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_GHA_FAILURES_WEBHOOK_URL }}
   # This job upgrades the support chart, staging hub, and dask-staging hub (if present)
   # for clusters in parallel, if those upgrades are required. This job needs the
   # `generate-jobs` job to have completed and set an output to the
@@ -245,6 +257,19 @@ jobs:
           with open(env_file, "a") as f:
               f.write(f"failure_{name}={failure}")
 
+      # https://github.com/ravsamhq/notify-slack-action
+      # Needs to be added per job
+      # When https://github.com/integrations/slack/issues/1563 gets implemented,
+      # we can use that instead
+      - name: Report Status
+        if: always()
+        uses: ravsamhq/notify-slack-action@v2
+        with:
+          notify_when: "failure"
+          status: ${{ job.status }} # required
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_GHA_FAILURES_WEBHOOK_URL }}
+
   # This jobs reduces the initially planned prod-hub-matrix-jobs deployments by
   # filtering out any deployment to a cluster with a failed support-and-staging
   # job.
@@ -292,6 +317,19 @@ jobs:
           with open(env_file, "a") as f:
               f.write(f"filtered-prod-hub-matrix-jobs={json.dumps(filtered_jobs)}")
 
+      # https://github.com/ravsamhq/notify-slack-action
+      # Needs to be added per job
+      # When https://github.com/integrations/slack/issues/1563 gets implemented,
+      # we can use that instead
+      - name: Report Status
+        if: always()
+        uses: ravsamhq/notify-slack-action@v2
+        with:
+          notify_when: "failure"
+          status: ${{ job.status }} # required
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_GHA_FAILURES_WEBHOOK_URL }}
+
   # This job upgrades production hubs on clusters in parallel, if required. This
   # job needs both the `filter-generate-jobs` to have completed to provide its
   # output `filtered-prod-hub-matrix-jobs`. It is a list of dictionaries with
@@ -341,3 +379,16 @@ jobs:
           max_attempts: 3
           command: |
             deployer run-hub-health-check ${{ matrix.jobs.cluster_name }} ${{ matrix.jobs.hub_name }}
+
+      # https://github.com/ravsamhq/notify-slack-action
+      # Needs to be added per job
+      # When https://github.com/integrations/slack/issues/1563 gets implemented,
+      # we can use that instead
+      - name: Report Status
+        if: always()
+        uses: ravsamhq/notify-slack-action@v2
+        with:
+          notify_when: "failure"
+          status: ${{ job.status }} # required
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_GHA_FAILURES_WEBHOOK_URL }}