Integrate gitlab-ci/allow_failure

--

Commit: seco-ne/yocto/infrastructure/gitlab-ci@6656c465

CI: allow failure in new jobs 'handle_artifacts' and 'report-image-diff'

It seems that these jobs are not yet completly errorsafe and we could
ignore the failure without changing the build artifacts.

.gitlab-ci @ 6656c465

-Subproject commit de9851beff4cbb43172bc3e2ad4709f8d9e00790
+Subproject commit 6656c465e99431b34e9674fe504592802088d37d

.gitlab-ci.yml

@@ -4,13 +4,13 @@
 # ---------------------------------------------------------------------------------------
 include:
   - project: '${CI_PROJECT_ROOT_NAMESPACE}/yocto/infrastructure/gitlab-ci'
-    ref: de9851beff4cbb43172bc3e2ad4709f8d9e00790
+    ref: 6656c465e99431b34e9674fe504592802088d37d
     file: 'manifest-pipeline-yocto.yml'
 
 variables:
   MANIFEST_PROJECT_ID: 1725
   MASTER_BRANCH: kirkstone
-  GITLAB_CI_REVISION: de9851beff4cbb43172bc3e2ad4709f8d9e00790
+  GITLAB_CI_REVISION: 6656c465e99431b34e9674fe504592802088d37d
 
 generate-build-pipeline:
   variables: