Added dockerfile, go.mod and go.sum to allow deployment via docker and automatic dependency downloads

[AnnoyingRain5]

No description provided.

[mrjvs]

Hey, thanks for the pr :)

Some changes are required before this can be merged:

1. Comment your dockerfile, we need to know whats going on
2. Use multistage, make one builder, one runner. so that we don't have unused files and dependencies after building, this will also improve runtime
3. In the steps, install dependencies first, then copy the rest of the source for building
4. don't use bullseye latest, use a static version of go.

if you are unsure of how this works, read this tutorial: https://dev.to/karanpratapsingh/dockerize-your-go-app-46pp

[mrjvs]

add a newline at end of file

[mrjvs]

@jonbarrow dockerfile tested, all looks good and works properly