CI build: maybe being privileged is enough

--HG--
branch : heptapod
1 job for topic/heptapod/ci in 2 minutes and 27 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Test
failed build #56899
docker-in-docker

00:02:27

 
Name Stage Failure
failed
build Test
	gitlab.com/gitlab-org/gitlab-runner/apps/gitlab-runner-helper
Number of parallel builds: 31

--> linux/amd64: gitlab.com/gitlab-org/gitlab-runner/apps/gitlab-runner-helper
# Build docker images
docker build -t octobus/heptapod-runner-helper:x86_64-751f66205e79 -f dockerfiles/build/Dockerfile.x86_64 dockerfiles/build
error during connect: Post http://docker:2375/v1.40/build?buildargs=%7B%7D&cachefrom=%5B%5D&cgroupparent=&cpuperiod=0&cpuquota=0&cpusetcpus=&cpusetmems=&cpushares=0&dockerfile=Dockerfile.x86_64&labels=%7B%7D&memory=0&memswap=0&networkmode=default&rm=1&session=t4e12pwz6h23b0w21qzv14ti2&shmsize=0&t=octobus%2Fheptapod-runner-helper%3Ax86_64-751f66205e79&target=&ulimits=null&version=1: dial tcp: lookup docker on 140.211.166.130:53: no such host
make: *** [Makefile:110: out/docker/prebuilt-x86_64.tar.xz] Error 1
ERROR: Job failed: exit code 1