slim Docker image with python3.8 and python3-igraph

igraph.Dockerfile

# from https://github.com/igraph/python-igraph/blob/master/docker/minimal/Dockerfile
FROM python:3.8-alpine AS build

RUN apk add --no-cache --update \
    make cmake gcc g++ libstdc++ git libxslt-dev libxml2-dev libc-dev \
    libffi-dev zlib-dev libxml2 zlib libtool autoconf automake \
    flex bison \
    && rm -rf /var/cache/apk/*

# this can take a while
# go and get a coffee
RUN pip3 install git+https://github.com/igraph/python-igraph

FROM python:3.8-slim

COPY --from=build /usr/local/lib/python3.8/site-packages/igraph /usr/local/lib/python3.8/site-packages/igraph
COPY --from=build /usr/local/bin/igraph  /usr/local/bin/igraph

WORKDIR /usr/src/app

COPY requirements.txt ./
RUN pip3 install --no-cache-dir -r requirements.txt

COPY your-script-file.py .

ENTRYPOINT [ "python3", "./your-script-file.py" ]