[feat] automatically add pre-build dmg to release page

[leikoilja]

Even though the user can now build their own app after pulling the repo and following the README instructions, it would be great to add automatically build executables/installs to the release page

[matthewknill]

Also for Windows please...

[leikoilja]

thanks for the ping @matthewknill , i ll try to take a closer look at this during the weekend and come back to you :)