Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -37,7 +37,7 @@ sync_mirror:
   when: always
   allow_failure: true
   script:
-    - git clone --bare "$CI_BUILD_REPO" mirror.git
+    - git clone --bare "$CI_REPOSITORY_URL" mirror.git
     - mkdir ~/.ssh && echo "$GITHUB_HOST_KEY" > ~/.ssh/known_hosts
     - eval $(ssh-agent -s) && ssh-add <(echo "$GITHUB_DEPLOY_KEY")
     - cd mirror.git