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

learn/learn-kubernetes-master/kiamol/ch12/docker-images/memory-allocator/Dockerfile

@@ -0,0 +1,19 @@
+FROM golang:1.15-alpine AS builder
+ENV CGO_ENABLED=0
+
+WORKDIR /src
+COPY ./src/go.mod .
+RUN go mod download
+
+COPY ./src/main.go .
+RUN go build -o /server
+
+# app
+FROM alpine:3.15
+
+EXPOSE 80
+CMD ["/app/server"]
+
+WORKDIR /app
+COPY ./src/config.toml .
+COPY --from=builder /server .