Steam allows you to host and deploy development builds of your game for testing, without being released to the public. Essentially you gain access to a private

Steam allows you to host and deploy development builds of your game for testing, without being released to the public. Essentially you gain access to a private game on Steam with one or more Steam opt-in betas, to test different branches. It's common to use a CI system to build and then deploy to a steam beta branch. The process of doing that is, however, a little bit... raw.