stop tailscale service after CI workload finishes

[oxtoacart]

Updates #205

[oxtoacart]

AFAICT, I don't have a way of running something after this in my test workflow to verify it worked.

To test manually, I temporarily logged the output of ps -ef both before and after stopping tailscaled, and you can see the results of that for Ubuntu and MacOS.

[jaxxstorm]

@oxtoacart I approved this, but I thought of a better way.

tailscaled has a -cleanup flag which should handle stopping everything

-cleanup
    	clean up system state and exit

We could potential net stop on Windows as well, maybe that's a better approach?

[oxtoacart]

tailscaled has a -cleanup flag which should handle stopping everything

I tried this on my Mac, and it doesn't stop any running tailscaled processes. Also, the cleanup that it does do happens on every run of tailscaled.

I do think it would be good to run after we kill tailscaled in order to leave DNS and routes in a good state.

We could potential net stop on Windows as well

It would be nice to support Windows, let me try that.

[jaxxstorm]

huh, that's sad. I do wonder if service tailscaled stop would be sufficient for Linux, but then we're relying on systemd to do its job properly

[oxtoacart]

I do wonder if service tailscaled stop would be sufficient for Linux

We're not installing tailscale as a service, we're just spawning the tailscaled daemon manually.

[oxtoacart]

Here's a CI run with temporary logging code that shows us successfully stopping the tailscale daemon and tailscale-ipn.exe on Windows.