(chore): update docker image to latest when pushing to master

.gitlab-ci.yml

@@ -202,6 +202,8 @@ prepare:production:
     - docker login -u gitlab-ci-token -p ${CI_BUILD_TOKEN} ${CI_REGISTRY}
     - docker build -t $CI_REGISTRY_IMAGE/server:$CI_PIPELINE_ID -f containers/server/Dockerfile dist/.
     - docker push $CI_REGISTRY_IMAGE/server:$CI_PIPELINE_ID
+    - docker tag $CI_REGISTRY_IMAGE/server:$CI_PIPELINE_ID $CI_REGISTRY_IMAGE/server:latest
+    - docker push $CI_REGISTRY_IMAGE/server:latest
   only:
     refs:
       - master