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Huge shootout to the Distrobox devs, you saved my day :)
I brew beer as a hobby. I've been using Joliebulle 3 for close to 10 years because it's FOSS and super simple to use, and I'm too lazy to switch to another brewing app. It's been unmaintained for almost 5 years, but it wonderfully does exactly what I want from a brewing software. I was missing this crucial "piece of equipment" since I migrated to Fedora.
Brew day is tomorrow. I forgot to look into it until it was almost too late.
I see! So a fancy chroot, if I understand you correctly.
In a way, but chroot only isolates file systems (process only has access to an isolated "root" which isn't the actual host's root). Rootless Podman/Docker goes a few steps beyond and utilizes cgroups, and user namespaces to isolate not only file systems, but also processes and networking.
Here is a high level overview.
And another one from Dan Walsh.