Subject: Test guix-system.sh fails when building from guix-1.0.0.tar.gz because docker-image.tmpl is missing

From: Ting-Wei Lan <[email-masked]>
Date: Fri, 17 May 2019 21:40:00 +0800

The last line of tests/guix-system.sh is:
guix system -n docker-image gnu/system/examples/docker-image.tmpl
It doesn't work when building from guix-1.0.0.tar.gz because the file
gnu/system/examples/docker-image.tmpl doesn't exist in the source
tarball. If I manually download the file from the git repository and put
it into the extracted source tree, the test passes.