Should set API key in environment

[calmh]

I don't remember if we've already talked about this somewhere / sometime, but it would be neat if syncthing-macos automatically set an API key in the environment. As is, if the API key is wrong things will stay "offline" unnecessarily.

(Is it a supported mode of operation to have a syncthing backend started outside of syncthing-macos? If not, we don't really need to have this configurable at all.)

[xor-gate]

We could dispatch running syncthing daemon with launchd automatically configured from the application. Not sure how easy it would be from Swift.

[xor-gate]

In my opinion the macOS bundle/application should only work with its own syncthing instance and the API key discovery on first run is already in implemented by you reading out the XML file with a delay time. I'm not sure what you mean by "set an API key in the environment" as it is only used in the scope of the REST client.