Dockerfile for building U-Boot on Alpine Linux

Dockerfile.alpine

# SPDX-License-Identifier: GPL-2.0+
# This Dockerfile is used to build an image containing basic stuff to be used
# to build U-Boot and run our test suites.

FROM alpine:3.15.0
MAINTAINER Heinrich Schuchardt <xypron.glpk@gmx.de>
LABEL Description=" This image is for building U-Boot inside a container"

# Install packages
RUN apk update
RUN apk add \
        alpine-sdk \
        bc \
        bison \
        dtc \
        flex \
        git \
        linux-headers \
        ncurses-dev \
        openssl-dev \
        python3 \
        py3-setuptools \
        python3-dev \
        sdl2-dev \
        sudo 

# Create our user/group
RUN echo uboot ALL=NOPASSWD: ALL > /etc/sudoers.d/uboot
RUN adduser -D uboot
RUN addgroup uboot wheel
USER uboot:uboot

WORKDIR /home/uboot
RUN git clone https://source.denx.de/u-boot/u-boot.git
WORKDIR /home/uboot/u-boot
RUN make sandbox_defconfig
RUN sed -i 's/CONFIG_ETH_SANDBOX_RAW=y/# CONFIG_ETH_SANDBOX_RAW is not set/g' .config
RUN make -j$(nproc)