Integrate gitlab-ci/fix-branch-protection-check

--

Commit: seco-ne/yocto/infrastructure/gitlab-ci@23680f48

Fix check for branch protection state

Since the changes of 939ade2b9f98b3e1569332270a7ab16ce7d70b4a we observe
that pipelines are executed on non-protected branches, which is not what
we want.

GitLab's documentation was a bit unclear on the according CI variables
CI_COMMIT_REF_PROTECTED and CI_MERGE_REQUEST_TARGET_BRANCH_PROTECTED, as
stated in this stack overflow answer:
https://stackoverflow.com/a/59023344/3018229

We need to explicitly check for the variable values to be "true" instead
of just checking whether they are set.

.gitlab-ci @ 23680f48

-Subproject commit 939ade2b9f98b3e1569332270a7ab16ce7d70b4a
+Subproject commit 23680f489b33d1fc2270958cf174f00701947774

.gitlab-ci.yml

@@ -4,9 +4,9 @@
 # ---------------------------------------------------------------------------------------
 include:
   - project: '${CI_PROJECT_ROOT_NAMESPACE}/yocto/infrastructure/gitlab-ci'
-    ref: 939ade2b9f98b3e1569332270a7ab16ce7d70b4a
+    ref: 23680f489b33d1fc2270958cf174f00701947774
     file: 'manifest-integration.yml'
 
 variables:
-  GITLAB_CI_REVISION: 939ade2b9f98b3e1569332270a7ab16ce7d70b4a
+  GITLAB_CI_REVISION: 23680f489b33d1fc2270958cf174f00701947774
   BB_RECIPE_NAME: u-boot-imx