gitlab ci pipeline

build for registry

.gitlab-ci.yml

+stages:
+  - build
+
+build_master:
+  stage: build
+  only:
+    - master
+  script:
+    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
+    - docker build --pull -t "$CI_REGISTRY_IMAGE" .
+    - docker push "$CI_REGISTRY_IMAGE"
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