add gitlab ci

2 jobs for master in 49 seconds
Name Stage Failure
build Build
Checking out b272e4c8 as master...

Skipping Git submodules setup
Executing "step_script" stage of the job script
$ docker login -u "gitlab-ci-token" -p "$CI_BUILD_TOKEN" $CI_REGISTRY
WARNING! Using --password via the CLI is insecure. Use --password-stdin.
Error response from daemon: Get unauthorized: incorrect username or password
Cleaning up file based variables
ERROR: Job failed: exit code 1