This PR fixes `docker compose up` but it doesn't have the test client ->
resource flow working but it prevent anything from erroring at startup.
This fixes:
* tokens (use the correct token for the client user agent we are using)
* randomize `name_suffix` at start up for connlib (we will eventually
allow options to set it manually)
* remove port ranges for relay (see firezone/product#613)
When using `docker compose build` or any other way of building docker
images in parallel the way the cache was working with the rust's
Dockerfile made the caches between images overlap and corrupt each
other. We add a `locked` which prevents multiple writers to the same
cache to fix this behaviour.
This brindgs connlib from its own separated repo to firezone's monorepo.
On top of bringing connlib we also add and unify the Dockerfile for all
rust binaries and add a docker-compose that can run a headless client, a
relay and a gateway which eventually will test the whole flow between a
client and a resource. For this to work we also incorporated some elixir
scripts to generate portal tokens for those components.
