fix ci job

4 jobs for master in 3 minutes and 1 second (queued for 27 seconds)
Status Job ID Name Coverage
  Build
failed #33073
build alpine-base

00:01:02

passed #33070
build atom-deep-learning

00:00:17

passed #33072
build docker-runner

00:01:26

passed #33071
build golang-builder

00:03:00

 
Name Stage Failure
failed
build alpine-base Build
Checking out ae3f8f1f as master...

Skipping Git submodules setup
Checking cache for dind-go...
Downloading cache.zip from https://s3-cn-east-1.qiniucs.com/gitlab-runner-cache/gitlab_runner/project/380/dind-go
Successfully extracted cache
$ docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
/bin/bash: line 81: docker: command not found
ERROR: Job failed: command terminated with exit code 1