New comment by superiums on void-packages repository

https://github.com/void-linux/void-packages/issues/40589#issuecomment-1324544967

Comment:
> `/dev/shm` is for SHared Memory IPC, it will be cleaned up up on logging out. [systemd/systemd#2039](https://github.com/systemd/systemd/issues/2039)

yeh, files in it will be cleaned.
but mount device to it , data is not saved in it. 
in arch and ubuntu , no data will loose if do the same thing.

maybe the mount options differs from each other.