Installing packages from Debian unstable in a Docker image based on stable#

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RUN apt-get update && \
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    apt-get -y --no-install-recommends install software-properties-common && \
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    add-apt-repository "deb http://httpredir.debian.org/debian sid main" && \
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    apt-get update && \
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    apt-get -t sid install -y --no-install-recommends libsqlite3-mod-spatialite

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FROM python:3.9.2-slim-buster as build
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# software-properties-common provides add-apt-repository
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RUN apt-get update && \
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    apt-get -y --no-install-recommends install software-properties-common && \
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    add-apt-repository "deb http://httpredir.debian.org/debian sid main" && \
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    apt-get update && \
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    apt-get -t sid install -y --no-install-recommends libsqlite3-mod-spatialite && \
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    apt clean && \
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    rm -rf /var/lib/apt && \
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    rm -rf /var/lib/dpkg
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RUN pip install datasette && \
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    find /usr/local/lib -name '__pycache__' | xargs rm -r && \
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    rm -rf /root/.cache/pip
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EXPOSE 8001
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CMD ["datasette"]