Investigate earthly as build wrapper.

[steersbob]

Proof of concept Earthfile for brewblox-devcon-spark:

wheels:
    FROM python:3.7
    COPY ./dist /app/dist
    COPY ./requirements.txt /app/requirements.txt

    ENV PIP_EXTRA_INDEX_URL=https://www.piwheels.org/simple
    ENV PIP_FIND_LINKS=/wheeley

    RUN set -ex \
        && pip3 install wheel \
        && pip3 wheel --wheel-dir=/wheeley -r /app/requirements.txt \
        && pip3 wheel --wheel-dir=/wheeley /app/dist/*

    SAVE ARTIFACT /wheeley

build:
    FROM python:3.7-slim
    EXPOSE 5000
    WORKDIR /app

    ARG service_info=UNKNOWN
    ENV SERVICE_INFO=${service_info}
    ENV BOOST_V=1.67.0

    COPY +wheels/wheeley /wheeley
    COPY ./binaries /app/binaries

    RUN set -ex \
        && pip3 install --no-index --find-links=/wheeley brewblox-devcon-spark \
        && rm -rf /wheeley \
        && pip3 freeze \
        && apt-get update -q \
        && apt-get install -yq \
        libboost-system${BOOST_V} \
        libboost-program-options${BOOST_V} \
        libboost-random${BOOST_V} \
        libboost-thread${BOOST_V}

    ENTRYPOINT ["python3", "-m", "brewblox_devcon_spark"]

    ARG TAG=local
    SAVE IMAGE --push brewblox/brewblox-devcon-spark:${TAG}

multiplatform:
    BUILD \
        --platform=linux/amd64 \
        --platform=linux/arm/v7 \
        +build