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

learn/learn-kubernetes-master/kiamol/ch14/docker-images/image-gallery/Dockerfile

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+FROM golang:1.15-alpine  AS builder
+ENV CGO_ENABLED=0
+
+WORKDIR /src
+COPY go.mod .
+RUN go mod download
+
+COPY main.go .
+RUN go build -o /server
+
+# app
+FROM alpine:3.15
+
+ENV IMAGE_API_URL="http://apod-api/image" \
+    ACCESS_API_URL="http://apod-log/access-log"
+
+CMD ["/web/server"]
+
+WORKDIR /web
+COPY index.html .
+COPY --from=builder /server .