add gitlab ci

.gitlab-ci.yml

+stages:
+  - build
+  - deploy
+variables:
+  GIT_DEPTH: "1"
+
+before_script:
+  - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+
+.build-image:
+  stage: build
+  script:
+    - docker build --pull -t $TARGET_IMAGE .
+    - docker push $TARGET_IMAGE
+
+build-x86:
+  extends: .build-image
+  tags:
+    - docker
+  variables:
+    TARGET_IMAGE: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG-x86
+
+build-arm:
+  extends: .build-image
+  tags:
+    - docker-arm
+  variables:
+    TARGET_IMAGE: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG-arm
+
+.deploy:
+  stage: deploy
+  tags:
+    - docker
+  script:
+    - docker pull $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG-x86
+    - docker pull $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG-arm
+    - docker manifest create $TARGET_IMAGE --amend $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG-x86 --amend
+      $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG-arm
+    - docker manifest push $TARGET_IMAGE
+
+deploy_latest:
+  extends: .deploy
+  variables:
+    TARGET_IMAGE: $CI_REGISTRY_IMAGE:latest
+  only:
+    - master
+
+deploy_branch:
+  extends: .deploy
+  variables:
+    TARGET_IMAGE: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG