Update .gitlab-ci.yml

3 jobs for master in 2 minutes and 20 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #2903
docker
build

00:00:43

 
  Test
passed #2904
docker
int-test

00:00:50

 
  Deploy
failed #2905
docker
docker-build

00:00:46

 
Name Stage Failure
failed
docker-build Deploy There is an unknown failure, please try again
hello-world.yml
pom.xml
src
target
$ docker --version
Docker version 18.05.0-ce, build f150324
$ docker build -t 'demo-app:1.0.0' ./
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
ERROR: Job failed: exit code 1