In the past few days, I've seen a number of people having trouble getting Lemmy set up on their own servers. That motivated me to create Lemmy-Easy-Deploy, a dead-simple solution to deploying Lemmy using Docker Compose under the hood.
To accommodate people new to Docker or self hosting, I've made it as simple as I possibly could. Edit the config file to specify your domain, then run the script. That's it! No manual configuration is needed. Your self hosted Lemmy instance will be up and running in about a minute or less. Everything is taken care of for you. Random passwords are created for Lemmy's microservices, and HTTPS is handled automatically by Caddy.
Updates are automatic too! Run the script again to detect and deploy updates to Lemmy automatically.
If you are an advanced user, plenty of config options are available. You can set this to compile Lemmy from source if you want, which is useful for trying out Release Candidate versions. You can also specify a Cloudflare API token, and if you do, HTTPS certificates will use the DNS challenge instead. This is helpful for Cloudflare proxy users, who can have issues with HTTPS certificates sometimes.
Quick note: For email, pretty much every VPS provider out there blocks port 25, which is needed for emails to send. They do this to prevent spam emails from being sent en-masse from their servers. This is likely why your Ansible installation is not sending emails.
Since it's uncommon for servers to support email, this script disables it by default. If your provider supports port 25 (or you get approved to use it, some VPS providers allow you to request access), check config.env and set USE_EMAIL to true. This will set up everything you need for email.
I haven't been able to test email, so let me know how it works if you do! This doesn't do any of the DNS verification some email provders require, so your emails might be sent to spam. Lemmy doesn't really have documentation about how to set this up properly. If someone makes guidelines for this, I can update my project to do that automatically as well.