gitlab-ci: Add config file

.gitlab-ci.yml

+---
+# ---------------------------------------------------------------------------------------
+# Include the default CI steps from the gitlab-ci repo
+# ---------------------------------------------------------------------------------------
+include:
+  - project: '${CI_PROJECT_ROOT_NAMESPACE}/yocto/infrastructure/gitlab-ci'
+    ref: 19ff9d080b2b029cd7afe21cf4f530c8df2c4c71
+    file: 'manifest-integration.yml'
+
+variables:
+  GITLAB_CI_REVISION: 19ff9d080b2b029cd7afe21cf4f530c8df2c4c71
+  BB_RECIPE_NAME: linux-seco-imx