Add Dockerfile, gitlab-ci

.gitlab-ci.yml

@@ -13,8 +13,8 @@ build:
   stage: build
   script:
     - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
-    - docker build -t ${CI_REGISTRY}/${CI_PROJECT_NAME}/polls:${CI_COMMIT_SHORT_SHA} .
-    - docker tag ${CI_REGISTRY}/${CI_PROJECT_NAME}/polls:${CI_COMMIT_SHORT_SHA} ${CI_REGISTRY}/${CI_PROJECT_NAME}/polls:latest
-    - docker push "${CI_REGISTRY}/${CI_PROJECT_NAME}/polls:${CI_COMMIT_SHORT_SHA}"
+    - docker build -t "$CI_REGISTRY_IMAGE/$CI_COMMIT_REF_NAME/polls:${CI_COMMIT_SHORT_SHA}" .
+    - docker tag "$CI_REGISTRY_IMAGE/$CI_COMMIT_REF_NAME/polls:${CI_COMMIT_SHORT_SHA}" "$CI_REGISTRY_IMAGE/$CI_COMMIT_REF_NAME/polls:latest"
+    - docker push "$CI_REGISTRY_IMAGE/$CI_COMMIT_REF_NAME/polls:${CI_COMMIT_SHORT_SHA}"
   tags:
     - k8s