Temporary transition Docker init (#34135)

rootfs/init

@@ -0,0 +1,23 @@
+#!/bin/execlineb -S0
+
+##
+## load default PATH (the same that Docker includes if not provided) if it doesn't exist,
+## then go ahead with stage1.
+## this was motivated due to this issue:
+## - https://github.com/just-containers/s6-overlay/issues/108
+##
+
+/bin/importas -D /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin PATH PATH
+export PATH ${PATH}
+
+##
+## Skip further init if the user has a given CMD.
+## This is to prevent Home Assistant from starting twice if the user
+## decided to override/start via the CMD.
+##
+
+ifelse { s6-test $# -ne 0 }
+{
+  $@
+}
+/etc/s6/init/init-stage1 $@