don't fail if the directory exist

debian/postinst

@@ -44,7 +44,7 @@ case "$1" in
     # Create directories and change ownership
     for i in ${gitlab_repo_path} ${gitlab_pid_path} ${gitlab_log_dir}\
     ${gitlab_shell_log}; do
-      mkdir $i
+      mkdir -p $i
       chown -R ${gitlab_user}: $i
     done