dockerfile

ARG python_version=3.9
ARG build_target=$python_version
ARG publish_target=$python_version

FROM python:$build_target as Builder

# Add arguments to container scope
ARG build_target
ARG package
ARG package_version

# Only add build tools for alpine image. The ubuntu based images have build tools already.
# This command fails with a warning on Ubuntu (sh) and succeeds without issue on alpine (bash).
RUN if [[ "$build_target" == *"alpine" ]] ; then apk add build-base ; fi

# Install packaer and build all dependencies.
RUN pip install $package==$package_version

# Build our actual container now.
FROM python:$publish_target

# Add args to container scope.
ARG python_version
ARG package
ARG maintainer=""
ARG TARGETPLATFORM=""
LABEL python=$version
LABEL package=$package
LABEL maintainer=$maintainer
LABEL org.opencontainers.image.description="python:$publish_target $package:$package_version $TARGETPLATFORM"


# Copy all of the python files built in the Builder container into this smaller container.
COPY --from=Builder /usr/local/lib/python$python_version /usr/local/lib/python$python_version