add support for multi-stage build in getting-started
-FROM golang:1.9.4-alpine3.7
-
+FROM golang:1.9.4-alpine3.7 as builder
WORKDIR /go/src/github.com/GoogleCloudPlatform/skaffold/examples/getting-started
-CMD ["./app"]
COPY main.go .
RUN go build -o app main.go
+
+FROM alpine:latest
+CMD ["./app"]
+COPY --from=builder /go/src/github.com/GoogleCloudPlatform/skaffold/examples/getting-started/app .
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