add dockerfile

Author: wzshiming

Dockerfile

@@ -0,0 +1,8 @@
+FROM golang:alpine AS builder
+WORKDIR /go/src/github.com/wzshiming/commandproxy/
+COPY . .
+RUN go install ./cmd/commandproxy
+
+FROM alpine
+COPY --from=builder /go/bin/commandproxy /usr/local/bin/
+ENTRYPOINT [ "/usr/local/bin/commandproxy" ]