bug#46297: nix-service-configuration is missing the default /bin/sh

[John Soo]

Hi guix,

I am working with nix at work and I found some issues with the sandbox configuration for nix.  The docs say that the default sandbox-paths should have a default mount for /bin/sh 

https://nixos.org/manual/nix/unstable/command-ref/conf-file.html?highlight=Sandbox-paths#description

Default:/bin/sh=/nix/store/zi90rxslsm4mlr46l2xws1rm94g7pk8p-busybox-1.31.1-x86_64-unknown-linux-musl/bin/busybox




I think that means we should add that option to the configuration file.




Thanks!




John