This "Review App" has its own URL, its own environment-specific build artefacts and reports, and a separate database. I can thus play around freely without interfering with production. It also allows me to verify reproducibly whether database migrations work.
All this is powered by freely available open source tools. More info at my blog: https://vincenttunru.com/fearless-deployments/
Server run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!