ci: add gate job for integration test branch protection (#169)

Add a single trailing job that waits for the full matrix of jobs to complete,
so only one job needs to be required in GitHub branch protection rules.

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

Author: fredbi

.github/workflows/integration-test.yml

@@ -51,3 +51,17 @@ jobs:
           path: 'internal/testintegration/*.coverage.*.out'
           name: 'integration.coverage.${{ matrix.os }}'
           retention-days: 1
+
+  # Single gate job for branch protection rules
+  integration-test:
+    name: integration test
+    needs: test
+    if: always()
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check matrix results
+        run: |
+          if [ "${{ needs.test.result }}" != "success" ]; then
+            echo "Matrix jobs failed or were cancelled"
+            exit 1
+          fi