Docker未被识别为内部或外部命令

我有以下.gitlab-ci.yml文件：

image: docker:latest

variables:
 DOCKER_DRIVER: overlay2

services:
 - docker:dind

before_script:
 - docker info

stages:
 - deploy

step-deploy-dev:
 stage: deploy
 script:
  - echo build and deploy
  - docker build -t myimage myproject/.
  - echo finished build and deploy..
 environment: master

有时（我无法确定原因）会出现以下错误：

Running with gitlab-runner 10.8.0 (079aad9e)
  on My-CI de8391de
Using Shell executor...
Running on DEVServer01...
Fetching changes...
HEAD is now at e5f12f9 Update .gitlab-ci.yml
From http://gitlab.ourinternalserver.nl/my/myproject
   e5f12f9..3b46be8  master     -> origin/master
Checking out 3b46be8a as master...
Skipping Git submodules setup
$ docker info
'docker' is not recognized as an internal or external command,
operable program or batch file.
ERROR: Job failed: exit status 9009

---

如果您看到此错误，您的作业将在配置了错误执行器的运行程序上运行。您的作业需要使用docker executor的跑步者

你可以在输出中看到它说：

Using Shell executor...

应该说

Using Docker executor with image docker:latest ...

您可以标记作业和docker运行程序，以确保作业仅在所需的运行程序上运行。 注册跑步者时，请指定“docker”等标记，然后在作业配置中添加标记属性：

step-deploy-dev:
 stage: deploy
 script:
  - echo build and deploy
  - docker build -t myimage myproject/.
  - echo finished build and deploy..
 environment: master
 tags:
  - docker

---

有时

？是否有其他部署步骤/阶段？