新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件

learn/learn-kubernetes-master/kiamol/ch16/docker-images/admission-webhook/Dockerfile

@@ -0,0 +1,18 @@
+FROM node:10.19.0-slim AS builder
+
+WORKDIR /src
+COPY src/package.json .
+RUN npm install
+
+# app
+FROM node:10.19.0-slim
+
+EXPOSE 8080
+ENV PORT="8080" \
+    USE_HTTPS="false"
+
+CMD ["node", "server.js"]
+
+WORKDIR /app
+COPY --from=builder /src/node_modules/ /app/node_modules/
+COPY src/ .