We ran RocketChat at work for a few years before migrating to Teams.
RC could be good, but maintaining it long-term was an enormous pain. Maybe it’s better now, certainly if you’re using docker… But a manual install was always a laborious task on upkeep for us. Also worth making sure you don’t need commercial features, as they’ve removed free features in the past to drive sales…
Make sure you dye your hair a fun color when you get to a comfy point with Rust, that way people know you’re a serious Rust dev (/s).