ci: add CI summary job to release-v0.76.x

Add the "CI summary" aggregation job to the CI workflow so the required
status check is reported on this release branch. Without it, dependabot
PRs targeting release-v0.76.x are blocked because the required "CI summary"
check never reports.

This mirrors the job already present on release-v0.77.x and newer.

Signed-off-by: Vincent Demeester <vdemeest@redhat.com>

Author: vdemeester

.github/workflows/ci.yaml

@@ -177,3 +177,33 @@ jobs:
   e2e-tests:
     needs: [build]
     uses: ./.github/workflows/e2e-matrix.yml
+  ci-summary:
+    name: CI summary
+    needs: [build, linting, tests, generated, multi-arch-build, e2e-tests]
+    runs-on: ubuntu-latest
+    if: always()
+    steps:
+    - name: Check CI results
+      run: |
+        results=(
+          "build=${{ needs.build.result }}"
+          "linting=${{ needs.linting.result }}"
+          "tests=${{ needs.tests.result }}"
+          "generated=${{ needs.generated.result }}"
+          "multi-arch-build=${{ needs.multi-arch-build.result }}"
+          "e2e-tests=${{ needs.e2e-tests.result }}"
+        )
+        failed=0
+        for r in "${results[@]}"; do
+          name="${r%%=*}"
+          result="${r#*=}"
+          echo "${name}: ${result}"
+          if [ "$result" != "success" ] && [ "$result" != "skipped" ]; then
+            failed=1
+          fi
+        done
+        if [ "$failed" -eq 1 ]; then
+          echo ""
+          echo "Some CI jobs failed or were cancelled"
+          exit 1
+        fi