gitlab-ci: add KVM job that actually builds basebox (closes #2)

2 jobs for master in 12 minutes and 46 seconds
latest
Status Job ID Name Coverage
  Test
failed #121576208
kvm
build

00:12:45

passed #121576207
test

00:00:58

 
Name Stage Failure
failed
build Test
    skip_checks=options.skip_checks)
File "./fdroid_basebox.py", line 357, in main
exec_vmdebootstrap(params, provider)
File "./fdroid_basebox.py", line 167, in exec_vmdebootstrap
subprocess.check_call(cmd)
File "/usr/lib/python3.5/subprocess.py", line 271, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/usr/sbin/vmdebootstrap', '--grub', '--image=/tmp/tmp5r9cmeth/basebox-stretch64.raw', '--size=1000G', '--mirror=http://deb.debian.org/debian', '--distribution=stretch', '--hostname=basebox-stretch64', '--enable-dhcp', '--user=vagrant/vagrant', '--package=apt-transport-https,ca-certificates,locales,openssh-server,perl,git,git-man,libcurl3-gnutls,liberror-perl,libexpat1,libldap-2.4-2,librtmp1,libsasl2-2,libsasl2-modules-db,libssh2-1,libjs-excanvas,libpython-stdlib,libpython2.7-minimal,libpython2.7-stdlib,libsqlite3-0,mercurial-common,mime-support,python,python-minimal,python2.7,python2.7-minimal', '--customize=/tmp/tmp5r9cmeth/fdroidserver-customize.sh', '--lock-root-password', '--systemd-network', '--sudo', '--sparse', '--verbose']' returned non-zero exit status 1
ERROR: Job failed: exit code 1