Don't create unix domain sockets in RuntimeDirectory just create it in /run #158
Description
nix-snapshotter/pkg/config/config.go
Line 15 in 387e220
This is considered not best-practice. Thins in RuntimeDirectory are by default private to the service (0600 permissions). and thus other services can not reach the socket.
Unix domain sockets should simply go into /run/nix-snapshotter.sock for when running globally and under $XDG_RUNTIME_DIR/nix-snapshotter.sock (/run/user/$uid/nix-snapshotter.sock) when running as local user. So that other services like Containerd can actually reach the socket without having to mess with permissions.