bug#64775: /run should be cleaned on boot

[Saku Laesvuori]

> > I vote for TMPFS, since that would also reduce flash wear.
> > Honestly I don't get why it's not already using TMPFS.
>
> One argument could be how much ram it takes:
> 
>   $ du -sc /run/*
>   12      /run/blkid
>   0       /run/booted-system
>   0       /run/current-system
>   1312    /run/setuid-programs
>   524     /run/udev
>   1848    total
> 
> That is with no explicit setuid programs configured, on a machine with a
> fairly minimal configuration.
> 
> Not a *huge* amount of ram, but not nothing, either...

I'd say it's effectively nothing for almost all devices capable of
running Guix. On my laptop the size of /run is 4804 (4.7M). In a quick
test one terminal window with only zsh running in it took almost 10
times as much ram.

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