Building with GoReleaser?

And publishing with Git Releases?

If so, you can copy one of the given examples, do a little find-and-replace, and viola, you've got your Webi installer!

Each example has four files that need to be modified, just slightly:

install.sh
install.ps1
releases.js
README.md

Releases with .tag.gz and .zip

See ./keypairs/ as an example.

rsync -av ./keypairs/ ./my-project/

Keypairs is packaged for Mac and Linux as .tar.gz, and as .zip for Windows.

Bare Releases (no compression)

See ./arc/ as an example.

rsync -av ./arc/ ./my-project/

Arc is an unarchive tool and, therefore, makes sense that it is released unpackaged, without compression.

Note: arc is the installed command name, while archiver is the package name. When you find-and-replace, you'll probably replace both with your command name, because your command and package probably have the same name.