This commit makes isOutdated validate a nodes necessity to update
against all namespaces, and not just the nodes own namespace (which made
more sense before).
getLastStateChange is now uses the passed namespaces as a filter,
meaning that not requesting any namespace will give you the total last
updated state.
In addition, the sync.Map is exchanged for a variant that uses generics
which allows us to remove some casting logic.
This commit adds dockerbuild to flakes.nix:
```
nix build .#headscale-docker
```
This uses the Nix infra to build and _does not_ use Dockerfile.
It currently works on Linux (no macOS)
This commit adds a flake.nix build file, it can be used for three
things:
Build `headscale` from local or straight from git:
nix build
or
nix build github:juanfont/headscale
Run and Build `headscale` from local or straight from git:
nix run
or
nix run github:juanfont/headscale
Set up a development environment including all our tools,
- linters
- protobuf tooling
- compilers
nix develop
