system-init is a wrapper around s6-linux-init.
system-init
0022.
/etc/s6-linux-init/goetia
PATH environment variable set to
/command:/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/libexec:/usr/local/libexec.
system-init is primarily intended to be used as an init for an acutal boot process, not for containers.