Maybe set up a development environment:
- Install Discourse for development using Docker
- If you use macOS, consider: Install Discourse on macOS for development
- For Ubuntu or Debian: Install Discourse on Ubuntu or Debian for Development
Any of these will let you use Discourse via http://localhost:4200/ These options all use MailHog to test SMTP without actually sending mail.
Update: I re-read the question and see you want to let other people use it. I don’t know if this answer actually helps. 