add failed workflow report job

Signed-off-by: Jade Carino <carino_jade@yahoo.co.uk>

.github/workflows/build.yaml

@@ -581,4 +581,17 @@ jobs:
         env:
            GH_TOKEN: ${{ secrets.GALASA_TEAM_GITHUB_TOKEN }}
         run: |
-          gh workflow run build.yaml --repo https://github.com/galasa-dev/simplatform --ref ${{ env.BRANCH }}
+          gh workflow run build.yaml --repo https://github.com/galasa-dev/simplatform --ref ${{ env.BRANCH }}
+
+  report-failure:
+    name: Report failure in workflow
+    runs-on: ubuntu-latest
+    needs: [log-github-ref, build-obr, build-obr-javadocs, build-obr-generic, trigger-next-workflows]
+    if: failure()
+
+    steps:
+      - name: Report failure in workflow to Slack
+        env: 
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
+        run : |
+          docker run --rm -v ${{ github.workspace }}:/var/workspace ghcr.io/galasa-dev/galasabld-ibm:main slackpost workflows --repo "obr" --workflowName "${{ github.workflow }}" --workflowRunNum "${{ github.run_id }}" --ref "${{ env.BRANCH }}" --hook "${{ env.SLACK_WEBHOOK }}"