run e2e tests only with ci/e2e label

Signed-off-by: Philippe Martin <phmartin@redhat.com>

Author: feloy

.github/workflows/e2e-tests.yaml

@@ -17,9 +17,16 @@
 
 name: e2e-tests
 
-on: [pull_request]
+on:
+  merge_group:
+  pull_request:
+    types: [labeled, synchronize, opened, ready_for_review, reopened]
+
+permissions:
+  contents: read
 
 jobs:
+  if: ${{ contains(github.event.pull_request.labels.*.name, 'ci/e2e') }}
   # Dedicated step to build the extension image
   build-container:
     name: Build Extension Image