Gitlab auto deploy don't working

Hello! I have .gitlab-ci.yml file like this, but CI don’t update files on my server. What I need to do to start it working?

deploy:
script:
- apt-get update -qq && apt-get install -y -qq lftp
- lftp -c "set ftp:ssl-allow no; open -u $USERNAME,$PASSWORD $HOST; mirror -Rnev ./ ./public_html --ignore-time --parallel=10 --exclude-glob .git* --exclude .git/"
only:
- master

What do the logs of your Runner look like?