feat: dockerize initial (WIP)

[Flash1232]

As discussed in stoatchat/self-hosted#176

TODOs:

• Finish Dockerfile
  • Prod stage (static dist after build)
  • Dev stage (expose source via volume mounts)
• Add CI build & push
• Update compose.yml in self-hosted repo

would be cool ™️ (maybe in follow-up PR):

• Add CSP and some basic hardening to nginx conf

[insertish]

Just a heads-up, build:prod is specifically referring to our production deployment, it is maybe a bit confusingly worded and should probably be renamed or removed entirely.

[Flash1232]

Making sure of that, thanks 👍

I'll be finishing up the MR presumably by the end of the weekend.