Add new file

.gitlab-ci.yml

+stages:
+  - build
+  - deploy
+
+variables:
+  DOCKER_HOST: tcp://localhost:2375/
+
+services:
+  - docker:dind
+
+build:
+  image: docker:latest
+  stage: build
+  script:
+    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
+    - docker build -t "$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
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