container: use symlink to replace link
container: use symlink to replace link

/dev/pts/ptmx is on the different filesystem with /dev/ptmx,
use symbol link.

Signed-off-by: Gao feng <847df59f7b32f8c32be21b40e9fcead2da431b78@hyper.sh>

gao-feng/hyperstart,hyperhq/hyperstart,bergwolf/hyperstart,jefby/hyperstart,gao-feng/hyperstart,gnawux/hyperstart,wcwxyz/hyperstart,gnawux/hyperstart,MarioCarrilloA/hyperstart,stigkj/hyperstart,MarioCarrilloA/hyperstart,bergwolf/hyperstart,jefby/hyperstart,wcwxyz/hyperstart,MarioCarrilloA/hyperstart,gnawux/hyperstart,laijs/hyperstart,hyperhq/hyperstart,laijs/hyperstart,stigkj/hyperstart