Fix s6-rc-compile by removing cont-init dependency or defining cont-init service

rootfs/etc/s6-overlay/s6-rc.d/cont-init/run

@@ -0,0 +1,4 @@
+#!/usr/bin/with-contenv bash
+This is a placeholder for cont-init, which runs scripts in /etc/cont-init.d/
+No further action needed as cont-init.d scripts are executed automatically
+exit 0