FEAT(planning#1067): Added git branch name export to pipeline

ci/gitlab-ci.yml

@@ -44,6 +44,8 @@ build:
   script:
     - export NEXT_PUBLIC_BASE_PATH="" && [[ "$CI_COMMIT_REF_NAME" != "main" ]] && export NEXT_PUBLIC_BASE_PATH="/entwicklungsportal/$CI_COMMIT_REF_SLUG"
     - echo $NEXT_PUBLIC_BASE_PATH
+    - export CURRENT_BRANCH=$CI_COMMIT_REF_NAME
+    - echo $CURRENT_BRANCH
     - yarn export
   artifacts:
     paths: