Add run-github-release action.

[XAMPPRocky]

This started out as a way to easily use mdbook for deploying, but it was easy enough to make it configurable to work with any github project's releases. I've tested that it works locally but I haven't tested it as a github action yet.

[XAMPPRocky]

@pietroalbini I think there's a bug in CI, since I'm on macOS ncc produces a slightly different build than when on CI.

[pietroalbini]

Could you try replacing requests with node-fetch? It has less code and no dependencies, but more importantly it doesn't have the dependency causing the diff (though-cookie).

[XAMPPRocky]

@pietroalbini I've migrated to node-fetch, but the diff persists.