Add Healthcheck Endpoint, Bind Server to 0.0.0.0 for Prod

[Gocnak]

It seems like by default fastify binds to 127.0.01 which is great for localhost development but not working in Prod. They mention it in their getting started guide, and while we do have HOST bound to 0.0.0.0 in the Dockerfile, I don't actually think Fastify was reading this?

Also, I used fastify-healthcheck to add a health check endpoint for Docker and our uptime page to get a proper status of the API. I'm not married to this specific implementation, we can always roll one ourselves, but this just seemed drag-n-drop and easy enough.

[tsa96]

Actually ugh, I think this might start responding too early, before Nest has done all it's module resolution stuff. I hate having to do a whole module for such a simple thing but actually I think it's the best approach, going to change this, one sec.

[tsa96]

Okay there's a version as Nest module

[tsa96]

I'll let you merge once happy with my stuff