Mettre à jour .gitlab-ci.yml, Dockerfile files

.gitlab-ci.yml

+---
+
+image: docker:stable
+variables:
+  IMAGE: $CI_REGISTRY_IMAGE
+  DOCKER_HOST: tcp://docker:2375/
+  DOCKER_DRIVER: overlay2
+stages:
+  - build
+  - test
+  - push
+
+services:
+- docker:19.03.8-dind
+
+Build docker image:
+  stage: build
+  before_script: &before_script
+    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+  script:
+    - docker build -t $IMAGE:$CI_COMMIT_SHA .
+    - docker push $IMAGE:$CI_COMMIT_SHA
+
+Push image:
+  stage: push
+  before_script: *before_script
+  script:
+    - docker pull $IMAGE:$CI_COMMIT_SHA
+    - docker tag $IMAGE:$CI_COMMIT_SHA $IMAGE:latest
+    - docker push $IMAGE:latest
+

Dockerfile

+FROM docker:19.03.8-dind
\ No newline at end of file