Well, yes, maybe, but that would be a big undertaking on level with our native extension system. You’d also have to upload and install signing identities to that system and I’m sure there are a lot of legal implications when handing over sensitive information like that. Not sure if this is something that has been discussed at some point, @Mathias_Westerdahl?
The service would be a lot like Unity Cloud Builds (a paid service btw) so it is definitely something that is possible to create, but I wonder if it’s really worth spending time implementing, especially considering the other high priority things we have in out roadmap.
There are services that offer cloud hosted OSX machines, for instance https://www.macincloud.com/