Fix path

[Duncaen]

Changes the PATH to match /etc/runit/{1,2,3}.

void-containers% podman run --rm -it ghcr.io/void-linux/void-glibc sh -c 'echo $PATH'
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

void-containers% podman build --target "image-default" --build-arg="LIBC=musl" . --tag fixed-path
void-containers% podman run --rm -it fixed-path sh -c 'echo $PATH'
/usr/bin:/usr/sbin

This resolves void-linux/void-packages#58440.

[Duncaen]

Drafted, it should probably include /usr/local PATHs, our containers might even depend on it, so matching /etc/runit/{1,2,3} is not good unless we change it there.