Reducing I/O of the build process

[Michael Tremer <michael.tremer@ipfire.org>]

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Hello,

I have noticed that when packing the image, we put quite a lot of
pressure on the disks. Our main build VMs become quite slow and even
slow down other machines like the web servers.

To avoid that, I have made a few changes:

/tmp is now a ramdisk and ccache is putting temporary files in there.

This helps a slot with smaller files that are written to disk or at
least the journal.

When the OS tarball for the CDROM is generated, this is now done
in memory and the OS is only written to disk again once. Saves us
again a gigabyte or so in writes.

All other temporary files are moved into /tmp to take advantage of
the ramdisk.

I do not expect any (significant) changes in build time, but if
anything, it could only have gone up. There is no extra memory
needed and the ramdisk is only enabled when enough memory is
available.

But please let me know if you notice any changes.

Best,
-Michael