我想 checkout 到合并请求管道中的dev分支，该管道是为与其他分支合并到dev而打开的。我将检查此作业中的某些内容，然后根据此作业的成功与否继续其他一些作业。是否可以执行此操作，或者我必须始终使用管道触发的分支？
添加gitlab配置的相关部分

variables:
  GIT_STRATEGY: clone

checksomething:
  rules:
    - if: $CI_PIPELINE_SOURCE == "merge_request_event" && $CI_MERGE_REQUEST_TARGET_BRANCH_NAME == "dev"
    - if: $CI_COMMIT_BRANCH && $CI_OPEN_MERGE_REQUESTS
      when: never
    - if: $CI_COMMIT_BRANCH
  environment:
    name: development
  before_script:
    - git checkout dev
  script:
    - !reference [.check-something-on-dev]

但我有这个错误：

$ git checkout dev
error: pathspec 'dev' did not match any file(s) known to git```