Add new file

.gitlab-ci.yml

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+image: "docker:latest"
+
+services:
+  - "docker:dind"
+
+before_script:
+  - "docker login -u \"$CI_REGISTRY_USER\" -p \"$CI_REGISTRY_PASSWORD\" $CI_REGISTRY"
+
+build-master:
+  stage: "build"
+  script:
+    - "docker build --pull -t \"$CI_REGISTRY_IMAGE\" ."
+    - "docker push \"$CI_REGISTRY_IMAGE\""
+  only:
+    - "master"
+
+build:
+  stage: "build"
+  script:
+    - "docker build --pull -t \"$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG\" ."
+    - "docker push \"$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG\""
+  except:
+    - "master"