Provide an option to specify the tmpfs size of the container

[luhux]

Hello everyone

I am using guix environment --container to containerize my programming 
environment and runtime environment, but I found that the container / created 
by this command uses tmpfs and cannot be resized.

When a file in the container outputs a lot of logs to the tmpfs of the 
container, the memory usage of the host will be very high (this is usually 
something I did not expect)

So can provide an option to specify the size of tmpfs?

thanks

luhux