Run build job on Linux
Run build job on Linux

Summary:
This works now with the Electron update. Wine doesn't work there so the app signing step needs to be disabled. I'm not entirely sure if this has other consequences than disabling signing - which we don't use.

We also can't build `.dmg`s on Linux because it relies on a CLI tool that only exists on Macs. But we can quite easily move this to GitHub Actions, which I set up with https://github.com/facebook/flipper/pull/852

Reviewed By: nikoant

Differential Revision: D20160545

fbshipit-source-id: a888c8b0e8f7dbe8bec818d57f5f22bcf800322c

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