NATS Server embedded as an option

[gedw99]

User Story

As a developer and operator I would like to have the option to run NATS Server embedded, so that I can run this system with or without a NATS Server.

This makes it easy to run on VPS or bare mental where port 25 is available too. Fly.io is an example of a hosting solution that allows port 25, and is an easy Docker deploy.

K8 is not effected by this, because the proposed solution for Config means that if a NATS Server URL is supplied then it used an external NATS Server.

Detailed Description

Nats Server has a simple way to do this.

https://github.com/maxpert/marmot/blob/master/stream/embedded_nats.go shows how its used.

https://github.com/maxpert/marmot/blob/master/stream/nats.go#L27C2-L27C2 shows the check to use the embed nats server or not.

Anything else

Config just needs a toggle to enable this. The checker above assumes to use embedded if its NOT in the .env config, which is a sensible way

[gedw99]

Looks like the .env file is missing the NATS line ?

https://github.com/kannon-email/kannon/blob/main/.env should have a NATS line but does not

https://github.com/kannon-email/kannon/blob/main/pkg/dispatcher/dispatcher.go#L25 calls it..

[ludusrusso]

Hi @gedw99,
sorry for the delay but I've completely miss the notification (too much notification from github) :D

Thanks for this, I didn't know it was possible.

I'm not having much time to maintain this project but I have the idea to simply the deployment and I'll take in consideration this issue in the future.