Just did after you said this what I get in end lines:
sudo: unable to resolve host discourse-ubuntu-s-1vcpu-1gb-nyc1-01-1606640043912-s-2vcpu-4gb-n: Name or service not known
Error response from daemon: Container 387d78b520911e93647a157c578f479a9b4ceaf4fef60b19c638a03de162444c is not running
Replacing: SMTP_PASSWORD
Replacing: LETSENCRYPT_ACCOUNT_EMAIL
Replacing: DEVELOPER_EMAILS
Replacing: DISCOURSE_DB_PASSWORD
Replacing: Sending mail to
==================== DONE! ====================