Update .gitlab-ci.yml, edited copy command to ommit hidden .git configuration files

1 job for master in 1 second (queued for 3 seconds)
Status Name Job ID Coverage
  Deploy
failed pages-master #1344
production

00:00:01

 
Name Stage Failure
failed
pages-master Deploy
Getting source from Git repository
Fetching changes with git depth set to 50...
Reinitialized existing Git repository in /opt/tomcat9/builds/gCnQN1L7/0/gitlab/01kran1mvm/3ds_visualization_cesium/.git/
Checking out 95abc6b8 as master...
Skipping Git submodules setup
Executing "step_script" stage of the job script
$ mkdir "$EXPORT_DIR/$CI_PROJECT_NAME"
mkdir: cannot create directory ‘/var/www/html/pages/3ds_visualization_cesium’: File exists
ERROR: Job failed: exit status 1