It does not upload files to the server. Lftp remains pending until it times out:
lftp -c "set ftp:ssl-allow no; open -u $FTP_HOST_DEPLOY_USERNAME,$FTP_HOST_DEPLOY_PASSWORD $FTP_HOST_DEPLOY; mirror -Rev ./dist/app ./public_html" --ignore-time --parallel=10 --exclude-glob .git* --exclude .git/ --no-perms