typo in ci

1 job for master in 27 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #11031
build

00:00:27

 
Name Stage Failure
failed
build Test
DEPRECATION: this GitLab server doesn't support refspecs, gitlab-runner 12.0 will no longer work with this version of GitLab
Cloning repository...
Cloning into '/builds/krause/burnpy'...
Checking out 05bdc61b as master...

Skipping Git submodules setup
$ docker login -u gitlab-ci-token -p $CI_JOB_TOKEN registry.git.mpib-berlin.mpg.de
/bin/bash: line 79: docker: command not found
ERROR: Job failed: exit code 1