You'll need a heroku app to deploy to if you don't have one already.

$ heroku create

With that, we can deploy. On Heroku, we'll need to setup the Rust toolchain and we can do that by using this Rust Buildpack. We don't want the Rust tools to run since that will happen in the assets:precompile rake task defined by helix-rails. We can tell the rust buildpack to do this, by writing out RustConfig at root of the application.

RUST_SKIP_BUILD=1

Then add the buildpack to the first position.

$ heroku buildpacks:add https://github.com/emk/heroku-buildpack-rust --index 1

Next, we'll need the Heroku Ruby buildpack to do the normal Ruby bits, if it's not already set.

$ heroku buildpacks:add heroku/ruby

Finally deploy:

$ git push heroku master