Add mandatory summary step for branches protection

.github/workflows/images.yml

@@ -14,7 +14,7 @@ defaults:
 
 jobs:
 
-  generate-jobs:
+  init:
     name: Generate Jobs
     runs-on: ubuntu-latest
     outputs:
@@ -31,8 +31,8 @@ jobs:
           echo "::set-output name=strategy::$strategy"
 
   test:
-    needs: generate-jobs
-    strategy: ${{ fromJson(needs.generate-jobs.outputs.strategy) }}
+    needs: init
+    strategy: ${{ fromJson(needs.init.outputs.strategy) }}
     name: ${{ matrix.name }}
     runs-on: ${{ matrix.os }}
     steps:
@@ -51,3 +51,15 @@ jobs:
         run: ${{ matrix.runs.test }}
       - name: '"docker images"'
         run: ${{ matrix.runs.images }}
+
+  summary:
+    runs-on: ubuntu-latest
+    needs: test
+
+    if: always()
+
+    name: images-test-summary
+
+    steps:
+      - name: Summary status
+        run: if ${{ needs.test.result != 'success' && needs.test.result != 'skipped' }}; then exit 1; fi