Sign OS X binaries

[Jelledb]

As of now, the OS X binaries are not signed. For some users, this results in a warning that the application is insecure and it has to be moved to the bin.

By signing our OS X binaries, this situation will no longer occur and it will increase the security of Collie for OS X users.

[dmurtic]

Currently it is not possible to successfully sign the MacOS binary. The signing process stops with the following error message main executable failed strict validation. I try to sign the binary directly and within an app bundle. It seems that the Deno Framework cause the issue here (see https://togithub.com/denoland/deno/issues/11154).

[Jelledb]

That's good to know @dmurtic. Could you add a small explanation for this to the README so new users will at least know why we currently do not support this?

Let's keep the issue open to track progress on Deno's side.