Dockerfile for go apps with the ability to bind to port 80

Dockerfile

# Go build
FROM golang:1.14 as build-go

ARG BUILD_TAG
ARG BUILD_DATE

ENV CGO_ENABLED=0
ENV GO111MODULE=on
ENV GOOS=linux
ENV GOPATH=/

WORKDIR /src/

COPY go.mod .
COPY go.sum .
RUN go mod download

COPY . .

RUN ./bin/build.sh --bin service

# Service definition
FROM alpine

RUN apk add --update libcap tzdata ca-certificates && rm -rf /var/cache/apk/*

COPY --from=build-go /src/service service

RUN setcap CAP_NET_BIND_SERVICE=+eip ./service
RUN update-ca-certificates

RUN addgroup -g 1000 -S runnergroup && adduser -u 1001 -S apprunner -G runnergroup
USER apprunner

ARG GIT_COMMIT=unknown
LABEL git-commit=$CI_COMMIT_SHA

ENTRYPOINT ["/service"]