[CI] Avoid diverging branches

.gitlab/.gitlab-ci.yml

@@ -33,16 +33,14 @@ stages:
     - git config pull.ff only
 
     # Force update of cached repository state
-    - git fetch origin "$CI_DEFAULT_BRANCH"
+    # - git fetch origin "$CI_DEFAULT_BRANCH"
     # create new branch or checkout existing branch
-    - git checkout "$CI_DEFAULT_BRANCH"
+    - git checkout -b "$CI_DEFAULT_BRANCH"
+    - git branch --set-upstream-to "origin/$CI_DEFAULT_BRANCH" "$CI_DEFAULT_BRANCH"
 
     # Debugging
     - git status
-    - git branch --all
-
-
-    - git pull
+    - git branch -v --all
 
   image:
     entrypoint: ['']