New file "tests/docker-inception.scm" with small problem

[Danny Milosavljevic]

Hi,

there's a new branch "wip-docker-test" which has a new (non-system) test 
tests/docker-inception.scm .

You can run it via:

  make TESTS=tests/docker-inception.scm check

Unfortunately, it fails with some inscrutable qemu error message:

qemu-system-x86_64: -virtfs 
local,path=/home/dannym/src/guix-ns14/guix/test-tmp/store,security_model=none,mount_tag=TAGy5ajggutlpmxibmqfchkokzxuwid:
 cannot ini
tialize fsdev 'TAGy5ajggutlpmxibmqfchkokzxuwid': failed to open 
'/home/dannym/src/guix-ns14/guix/test-tmp/store': No such file or directory

Trying to fix it (setting NIX_STORE etc) made it worse, so I reverted that part.

Help?

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