The developers of Rust are allowing you to test the game's day-to-day workings ahead of its release in the next monthly wip.
You can switch the server to "Staging" mode, under this mode the server will receive updates almost every day as the developers release them.
You can read more here: https://www.corrosionhour.com/what-is-the-rust-staging-branch/
You can switch the server in the main menu using the "Switch to Staging" button.
