Add BuildKit and docker manifest command. close #390 ,close #391

Signed-off-by: khs1994 <khs1994@khs1994.com>

image/demo/buildkit/Dockerfile

@@ -0,0 +1,16 @@
+FROM node:alpine as builder
+
+WORKDIR /app
+
+COPY package.json /app/
+
+RUN npm i --registry=https://registry.npm.taobao.org \
+        && rm -rf ~/.npm
+
+COPY src /app/src
+
+RUN npm run build
+
+FROM nginx:alpine
+
+COPY --from=builder /app/dist /app/dist