Docker-compose가 docker-compose.yml, Filepermissions를 찾지 못합니까?

Question

방금 git-repository(https://github.com/mailcow/mailcow-dockerized) 다음을 사용하여 도커 이미지를 가져오고 싶었습니다.

docker-compose pull

하지만 docker-compose을(를) 찾을 수 없습니다 docker-compose.yml.

디렉터리 목록과 docker-compose출력은 다음과 같습니다.

root@xxx:/opt/mailcow-dockerized# ll
total 132
drwxr-xr-x 6 root root  4096 Jun  1 12:52 ./
drwxr-xr-x 4 root root  4096 Jun  1 12:48 ../
-rw-r--r-- 1 root root  3223 Jun  1 12:48 CODE_OF_CONDUCT.md
-rw-r--r-- 1 root root   954 Jun  1 12:48 CONTRIBUTING.md
drwxr-xr-x 6 root root  4096 Jun  1 12:48 data/
-rw-r--r-- 1 root root 15111 Jun  1 12:48 docker-compose.yml
lrwxrwxrwx 1 root root    12 Jun  1 12:48 .env -> mailcow.conf
-rwxr-xr-x 1 root root  7275 Jun  1 12:48 generate_config.sh*
drwxr-xr-x 8 root root  4096 Jun  1 12:48 .git/
drwxr-xr-x 3 root root  4096 Jun  1 12:48 .github/
-rw-r--r-- 1 root root   970 Jun  1 12:48 .gitignore
drwxr-xr-x 2 root root  4096 Jun  1 12:48 helper-scripts/
-rw-r--r-- 1 root root 35141 Jun  1 12:48 LICENSE
-rw------- 1 root root  4132 Jun  1 12:52 mailcow.conf
-rw-r--r-- 1 root root   992 Jun  1 12:48 README.md
-rw-r--r-- 1 root root  1746 Jun  1 12:48 .travis.yml
-rwxr-xr-x 1 root root 16845 Jun  1 12:48 update.sh*

root@xxx:/opt/mailcow-dockerized# docker-compose pull
ERROR:
Can't find a suitable configuration file in this directory or any
    parent. Are you in the right directory?

    Supported filenames: docker-compose.yml, docker-compose.yaml

제 생각엔 정말 분명한 뭔가를 놓치고 있는 것 같아요...