multi stage docker example

Dockerfile

FROM golang:1.16-alpine as builder

LABEL maintainer="Wattanakorn Intanon <watttanakorn.in@avilon.co.th>"

RUN apk update && apk add gcc git

RUN mkdir /mqtt-aggregator

WORKDIR /mqtt-aggregator
COPY go.mod .
COPY go.sum .

COPY . .

RUN go build ./...

RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -installsuffix cgo -o mqtt-aggregator

FROM alpine:latest
RUN apk --no-cache add ca-certificates
WORKDIR /app/
COPY --from=builder /mqtt-aggregator/mqtt-aggregator .

ENTRYPOINT ["./mqtt-aggregator"]