initial ci config

.gitlab-ci.yml

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+image: docker:19.03
+services:
+  - docker:19.03-dind
+variables:
+  DOCKER_DRIVER: overlay
+  DOCKER_TLS_CERTDIR: ""
+stages:
+  - buildx
+  - deploy
+
+buildx:
+  image: docker:19.03-git
+  stage: buildx
+  variables:
+    GIT_STRATEGY: none
+  artifacts:
+    paths:
+      - buildx
+    expire_in: 1 hour
+  services:
+    - docker:19.03-dind
+  script:
+    - export DOCKER_BUILDKIT=1
+    - git clone git://github.com/docker/buildx ./docker-buildx
+    - docker build --platform=local -o . ./docker-buildx
+
+deploy:
+  image: docker:19.03
+  stage: deploy
+  services:
+    - name: docker:19.03-dind
+      command: ["--experimental"]
+  before_script:
+    - mkdir -p ~/.docker/cli-plugins
+    - mv buildx ~/.docker/cli-plugins/docker-buildx
+    - docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+  variables:
+    IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
+  script:
+    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+    - docker buildx create --use --name mybuilder
+    - docker buildx build --platform linux/amd64,linux/arm64,linux/arm/v7 --push -t $CI_REGISTRY_IMAGE:latest .