Build Golang application in Dockerfile, with private repositories in dependencies, without experimental features.

Dockerfile

# NB! not for production!
# https://docs.docker.com/engine/reference/builder/#arg
# Warning: It is not recommended to use build-time variables for passing secrets like github keys, user credentials etc. Build-time variable values are visible to any user of the image with the docker history command.
FROM golang:1.13 as builder

# This argument should be defined as your personal access tokens, from: https://github.com/settings/tokens
ARG GITHUB_ACCESS_TOKEN

# Any kind of configurations:
ENV GO111MODULE=on
ENV GOFLAGS=" -ldflags '-w'"
ENV GOPROXY=direct
ENV GOSUMDB=off

# Setup your repo
WORKDIR /go/src/repo

# Caching layers for dependencies
COPY ./go.mod ./go.sum ./
RUN git config --global url."https://${GITHUB_ACCESS_TOKEN}:@github.com/".insteadOf "https://github.com/" && \
    go mod download && \
    git config --global --unset url."https://${GITHUB_ACCESS_TOKEN}:@github.com/".insteadOf

# Build stage
COPY . .
RUN go build -o /go/bin/application .


# Result container:
# Use debian if your binary depends on some shared libraries.
# FROM debian:10-slim
FROM busybox:latest
WORKDIR /root
COPY --from=builder /go/bin/application ./application
CMD ["./application"]

NB! Not for production!

Documentation

Warning: It is not recommended to use build-time variables for passing secrets like github keys, user credentials etc. Build-time variable values are visible to any user of the image with the docker history command.