gatling

Your needs might be different from mine, but I'm using Gatling for push-to-deploy on a couple of production Elixir apps. It includes the ability to do hot upgrades. Deployment couldn't be much easier than this. https://github.com/hashrocket/gatling

Heroku is fine for development. However, it does not work with hot code swapping. There are ways around it, and some people don't believe it's a gain. There is also https://github.com/hashrocket/gatling that promises the Git push workflow but with hot upgrading capability.

I haven't used these seriously yet, but when I looked at the options for deploying Elixir web applications (on a single host), I liked Gatling (https://github.com/hashrocket/gatling), ansible-elixir-stack (https://github.com/HashNuke/ansible-elixir-stack) and, with a few more reservations, Dokku (https://github.com/dokku/dokku) with the appropriate buildpacks. On a side note, if you work with Ansible, HashNuke's project is worth a closer look even if do not end up using it. It's well-structured and shows how an Ansible role can do both server configuration management and deployment. The pattern works really well; the only downside to this particular implementation is that it has the server pull your code from a Git repository, meaning the server must have access to it, instead of having your development machine copy the code to the server