This adds support for binary caches that are stored in a local
directory, similar to how nix supports local directories with nix copy. They can be used by setting the binary cache URL to
file:///path/to/cache. This is especially useful when hosting a binary
cache and running nar-serve on the same host, because this eliminates
the need to transfer the nar over HTTP and possibly encrypting and
decrypting it when using TLS.
This adds support for binary caches that are stored in a local directory, similar to how nix supports local directories with
nix copy. They can be used by setting the binary cache URL tofile:///path/to/cache. This is especially useful when hosting a binary cache and running nar-serve on the same host, because this eliminates the need to transfer the nar over HTTP and possibly encrypting and decrypting it when using TLS.