FROM golang:1.15-alpine as build
RUN apk add --no-cache git

WORKDIR /src 

COPY go.sum /src/
COPY go.mod /src/
RUN go mod download

COPY app.go /src

RUN go build -o app

FROM alpine:3.12

RUN mkdir -p /app
COPY --from=build /src/app /app/app
CMD ["./app/app"]