Don't lose "executable bit" in binary releases

[Hi-Angel]

ATM eask binary releases are packed with zip which does not support permissions and hence eask binary is not executable when the archive is unpacked. Gotta change zip to some tar.foo, like tar.gz or tar.zstd, or perhaps something else that supports the bit.

Steps to reproduce

1. Unpack latest release for linux from releases page
2. Execute ./eask --help

Expected

It will show help message

Actual

The command will fail as eask isn't an executable file

[jcs090218]

I've published a new release with .tar.gz, see https://github.com/emacs-eask/cli/releases/tag/0.9.5.

Hope this helps! :)