Fix gitlab-ci syntax

Move LABEL to Dockerfile

.gitlab-ci.yml

-image: ${CI_REGISTRY_IMAGE}/ubuntu_python3:latest
-
-LABEL maintainer "frank@sauerburger.com"
+image: ${CI_REGISTRY_IMAGE}
 
 stages:
   - test

Dockerfile

 # This image is intended for the git CI
 
 FROM ubuntu:16.04
+LABEL maintainer "frank@sauerburger.com"
+
 
 RUN apt-get update && apt-get install -y  \
   python3 python3-setuptools git recode\