add docker command for git

.gitlab-ci.yml

@@ -72,7 +72,7 @@ format:
     - docker login -u $CI_USER_NAME -p $GITLAB_ACCESS_TOKEN $CI_REGISTRY
   script:
     #- docker run -v $(pwd):/project $CI_REGISTRY/r3/docker/julia-custom --project=@. -e 'using JuliaFormatter; format(".", verbose=true);'
-    - if [[ $(git status -s | wc -l) -gt 0 ]]; then
+    - if [[ $(docker run -i -v $(pwd):/git alpine/git status -s | wc -l) -gt 0 ]]; then
         GITHUB_COMMENT="There are files that need formatting.";
       else
         GITHUB_COMMENT="All files are formatted properly :white_check_mark:";