Get a working docker compose setup

[ujh]

This needs to run:

1. Postgres 14
2. Redis 6
3. Puma
4. Sidekiq
5. webpack-dev-server (or whatever we are using at the time)

It needs to have the following features:

1. An easy way to run the tests (both Ruby and JS)
2. A way to run the app locally
3. An efficient way of recompiling the JavaScript and CSS assets when they change (e.g. webpack-dev-servier)

-> The last point is where it failed last time and Rails always compiled all the assets on every request.