Cache management

[mosteo]

To avoid unbounded growth.

I'm thinking of something simple, like having a size soft limit and evict the oldest builds when exceeded.

[Fabien-Chouteau]

I feel like this will be a headache to implement. How would you compute the size of builds?

[mosteo]

It could turn out to be, but I was thinking of simply the size of the folder, we already have one Alire.Directories.Tree_Size. Also I was thinking of treating it as a very soft limit: not deleting anything younger than e.g. one week to avoid cycling, and probably make it only on demand, something like docker system prune, git gc, pip cache purge (those are the similar ones I can think of).