Golang simple multistage dockerfile with non-root user.

Dockerfile

# build stage
FROM golang:1.17-alpine3.15 AS build-env
RUN apk add build-base

ADD . /src

RUN cd /src && go build -o main

# final stage
FROM alpine

WORKDIR /app

COPY --from=build-env /src/main /app/

# create user and give it permission
RUN addgroup -S appgroup && adduser -S appuser -G appgroup
RUN chown -R appuser:appgroup /app
USER appuser

ENTRYPOINT ./main