add automatic image build

.gitlab-ci.yml

+stages:
+  - docker_image_push
+
+docker_image_push:
+  before_script: [ ] #prevent global before_script from running
+  variables:
+    CI_CUSTOM_IMAGE_NAME: kypo-ansible-runner
+  stage: docker_image_push
+  image:
+    name: gcr.io/kaniko-project/executor:v1.3.0-debug
+    entrypoint: [ "" ]
+  script:
+    - export CI_CUSTOM_REGISTRY_IMAGE="${CI_REGISTRY}/${CI_CUSTOM_REGISTRY_PATH}/${CI_CUSTOM_IMAGE_NAME}"
+    - echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_CUSTOM_REGISTRY_USER\",\"password\":\"$CI_CUSTOM_REGISTRY_PASSWORD\"}}}" > /kaniko/.docker/config.json
+    - /kaniko/executor --context $CI_PROJECT_DIR --dockerfile $CI_PROJECT_DIR/Dockerfile --destination $CI_CUSTOM_REGISTRY_IMAGE:$CI_COMMIT_TAG
+  only:
+    - tags
+  except:
+    - branches
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