If `FIREZONE_DNS_CONTROL` is set to `systemd-resolved`, then shell out
to `resolvectl` to request all system DNS queries to go to Firezone's
sentinel DNS server(s).
```[tasklist]
- [ ] Figure out how to stop the runner from using the Docker bridge iface
```
---------
Signed-off-by: Reactor Scram <ReactorScram@users.noreply.github.com>
Co-authored-by: Thomas Eizinger <thomas@eizinger.io>
Regardless of `FIREZONE_DNS_CONTROL`, always try to notify systemd that
we've started.
I had accidentally conflated the idea of running as a systemd service
with the idea of using systemd to control DNS. They're separate, but
I'll keep the service unit in here and always use `sd-notify` since it
should be harmless to use even in Alpine.
~~If `FIREZONE_DNS_CONTROL` is `systemd-resolved`, try to notify systemd
that we've finished startup and the tunnel is ready.~~
Also adds a CI test, including a systemd service file that is **not**
ready for general use.
Ready for review once it's green.
---------
Signed-off-by: Reactor Scram <ReactorScram@users.noreply.github.com>
Co-authored-by: Thomas Eizinger <thomas@eizinger.io>
