feat(na): cache docker image to make booting quicker

[mrjones-plip]

Description

This PR adds a Dockerfile that runs the apk add commands that we used to run every time you booted up the docker service. By caching this install command, the boot up time, and specifically the time to be able to start serving HTTP requests, is a lot less. This is especially true when developers (like me!) use docker rm -f $(docker ps -qa) to frequently cull all running services.

License

The software is provided under AGPL-3.0. Contributions to this project are accepted under the same license.

[mrjones-plip]

Maybe there's some other optimizations, but I'm rescinding this PR as the speed gain is nominal at best. Here's timings of running docker rm -f $(docker ps -qa) && docker compose up and waiting until I see:

cht-hugo  | Running in Fast Render Mode. For full rebuilds on change: hugo server --disableFastRender
cht-hugo  | Web Server is available at http://localhost:1313/ (bind address 127.0.0.1) 
cht-hugo  | Press Ctrl+C to stop

main	branch
7.14	6.71
7.06	6.39
9.61	6.31
8.41	10.24
7.05	6.48

Even changing the entry point from ENTRYPOINT ["hugo", "server", "--buildDrafts", "--buildFuture", "--bind", "0.0.0.0"] to ENTRYPOINT ["hugo", "server"] didn't seem to make a difference

🤷

[mrjones-plip]

Good news everybody! The version we're about to ship in #2152 seems to reduce compile time by ~1sec 😅