Update dockerfile

buster.dockerfile

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+ARG IFLAGS="--quiet --no-cache-dir --user"
+
+FROM python:3.7.7-slim-buster as build
+ARG IFLAGS
+WORKDIR /root
+ENV FREETDS /root/freetds.conf
+ENV PATH /root/.local/bin:$PATH
+ENV TINI_VERSION v0.16.1
+ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /usr/bin/tini
+COPY CHANGELOG.rst .
+COPY README.rst .
+COPY freetds.conf .
+COPY setup.cfg .
+COPY setup.py .
+COPY pyproject.toml .
+COPY .pre-commit-config.yaml .
+COPY .pylintrc .
+COPY .git ./.git
+COPY src ./src
+COPY test ./test
+RUN \
+    chmod +x /usr/bin/tini && \
+    apt-get -qq update --fix-missing && \
+    apt-get -qq install -y --no-install-recommends git && \
+    pip install ${IFLAGS} "." && \
+    apt-get -qq clean && \
+    apt-get -qq autoremove -y --purge && \
+    rm -rf /var/lib/apt/lists/*
+
+FROM build as lint
+ARG IFLAGS
+WORKDIR /root
+ENV IMAGE dsdk.lint
+RUN \
+    pip install ${IFLAGS} ".[all]"
+ENTRYPOINT [ "/usr/bin/tini", "--" ]
+CMD [ "pre-commit", "run", "--all-files" ]
+
+FROM lint as test
+WORKDIR /root
+ENV IMAGE dsdk.test
+ENTRYPOINT [ "/usr/bin/tini", "--" ]
+CMD [ "python", "setup.py", "test" ]

dockerfile

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+buster.dockerfile