Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -1,16 +1,23 @@
+.install_docker: &install_docker |
+      apt-get update
+      apt-get -y install apt-transport-https ca-certificates curl software-properties-common
+      curl -fsSL https://download.docker.com/linux/debian/gpg | apt-key add -
+      add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable"
+      apt-get update
+      apt-get -y install docker-ce
+
 # This file is a template, and might need editing before it works on your project.
 docker-build:
   # Official docker image.
-  image: docker:20.10.6
+  image: python:3.6.5
   variables:
     DOCKER_HOST: tcp://docker:2375
     DOCKER_TLS_CERTDIR: ""
   stage: build
   tags:
     - docker
-  services:
-    - docker:20.10.6-dind
   before_script:
+    - *install_docker
     - docker info
     - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
   script:
@@ -21,16 +28,15 @@ docker-build:
     
 docker-build-master:
   # Official docker image.
-  image: docker:20.10.6
+  image: python:3.6.5
   variables:
     DOCKER_HOST: tcp://docker:2375
     DOCKER_TLS_CERTDIR: ""
   stage: build
   tags:
     - docker
-  services:
-    - docker:20.10.6-dind
   before_script:
+    - *install_docker
     - docker info
     - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
   script: