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As far as I can see, the cachix server is not something that is open source and I can host within my org?
no. but the mechanism itself is built into nix, so if you would like to do that locally, just follow their instructions
afaict the USPs of cachix are the client and compression
locally = ?
potentially, I would like to access the same cache from multiple pipelines and from different containers
I think you need ssh with access to nix
check man nix-copy-closure
what instructions were you referring to in your first response?
that would be nix serve or so
so I guess cachix also removes the requirement of having unsafe ssh access
that's what i do. but you are limited to linux cache.
nix ssh involved when using nix-serve