improve IT action failure message

Use the github api to retrieve links to all the failed matrix builds for
presentation in the aggregate step. Note the aggregate step exists so
that we have a single job we can point at from our branch protection
rules.

Signed-off-by: Robert Young <robertyoungnz@gmail.com>

Author: robobario

.github/workflows/integration-tests.yaml

@@ -85,9 +85,25 @@ jobs:
     runs-on: ubuntu-latest
     needs: run_integration_tests
     if: always()
+    permissions:
+      actions: read
     steps:
     - name: 'Check all matrix builds'
-      run: ${{!contains(needs.*.result, 'failure')}}
+      env:
+        GH_TOKEN: ${{ github.token }}
+      run: |
+        FAILED_JSON=$(gh api repos/${{ github.repository }}/actions/runs/${{ github.run_id }}/jobs \
+          --jq '.jobs[] | select(.conclusion=="failure") | {name: .name, url: .html_url}')
+        if [ -z "$FAILED_JSON" ]; then
+          echo "All jobs passed!" >> $GITHUB_STEP_SUMMARY
+          echo "No failures detected."
+          exit 0
+        fi
+        echo "Failed Matrix Jobs" >> $GITHUB_STEP_SUMMARY
+        echo "The following instances failed:"
+        echo "$FAILED_JSON" | jq -r '"* [\(.name)](\(.url))"' >> $GITHUB_STEP_SUMMARY
+        echo "$FAILED_JSON" | jq -r '"\(.name): \(.url)"'
+        exit 1
   integration_test_filter_archetype:
     runs-on: ubuntu-latest
     steps: