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source: fix apt warnings

Lyndon Brown requested to merge jnqnfe/live-build:source_apt_err into master

the source stage emitted the following output for each packages downloaded. note the troubling warning at the end.

Reading package lists... Done
NOTICE: 'grep' packaging is maintained in the 'Git' version control system at:
https://salsa.debian.org/debian/grep.git
Please use:
git clone https://salsa.debian.org/debian/grep.git
to retrieve the latest (possibly unreleased) updates to the package.
Need to get 1579 kB of source archives.
Get:1 http://deb.debian.org/debian buster/main grep 3.3-1 (dsc) [2038 B]
Get:2 http://deb.debian.org/debian buster/main grep 3.3-1 (tar) [1473 kB]
Get:3 http://deb.debian.org/debian buster/main grep 3.3-1 (diff) [104 kB]
Fetched 1579 kB in 1s (1293 kB/s)
Download complete and in download only mode
W: Download is performed unsandboxed as root as file 'grep_3.3-1.dsc' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)

this occurred because the '_apt' user did not have permission to write to the destination directory and so was falling back to downloading as root in order to do its work.

prior to 158950b8 all source packages were downloaded directly to the root of the chroot. that commit changed this to save them into a new clean directory within it instead. thus to fix the problem we can simply set the permission of this new directory to 777.

Gbp-Dch: Short

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