eatmydata is not being used in the build chroot
_Originally created by @intrigeri on [#9419 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/9419)_
We’re using eatmydata to speed up the build a bit. However, it’s not
actually used for most of the build, since:
- we currently install eamydata via the first huge `apt-get install`
run, so this one is not covered by eatmydata, which is too bad since
it’s likely the biggest generator of disk writes;
- `live-build`’s `Chroot` function cleans the environment and only
passes through a few environment variables to the commands it runs.
We need to make it forward `LD_PRELOAD`. And while we’re at it, we
can as well forward `FAKETIME`, which will help when working on
tails/tails#5630.
Feature Branch: bugfix/9419-eatmydata-in-build-chroot;live-build:tails/debian-old-2.0+faketime
### Related issues
- **Related to** tails/tails#9523
- **Blocks** tails/tails#5630
issue