try docker build on gitlab

require docker in gitlab
use kaniko to build docker in gitlab

.gitlab-ci.yml

@@ -0,0 +1,11 @@
+build:
+  stage: build
+  image:
+    name: gcr.io/kaniko-project/executor:v1.9.0-debug
+    entrypoint: [""]
+  script:
+    - /kaniko/executor
+      --context "${CI_PROJECT_DIR}"
+      --dockerfile "${CI_PROJECT_DIR}/Dockerfile"
+#  rules:
+#    - if: $CI_COMMIT_TAG