Fix health check failures not notifying (#58)

Author: kleinjm

.github/workflows/health_check.yml

@@ -25,9 +25,9 @@ jobs:
         run: make test
 
       - name: Notify slack
+        if: failure()
         uses: kpritam/slack-job-status-action@v1
         with:
-          if: failure()
           job-status: ${{ job.status }}
           slack-bot-token: ${{ secrets.SLACK_BOT_TOKEN }}
           channel: eng-notifications