ci: Use DOCKER_BUILDKIT for lint image

Can be reviewed with:
--color-moved=dimmed-zebra  --ignore-all-space

ci/lint_imagefile

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+# See test/lint/README.md for usage.
+
+FROM debian:bookworm
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV LC_ALL=C.UTF-8
+
+COPY ./.python-version /.python-version
+COPY ./ci/lint/docker-entrypoint.sh /entrypoint.sh
+COPY ./ci/lint/04_install.sh /install.sh
+
+RUN /install.sh && \
+  echo 'alias lint="./ci/lint/06_script.sh"' >> ~/.bashrc && \
+  chmod 755 /entrypoint.sh && \
+  rm -rf /var/lib/apt/lists/*
+
+
+WORKDIR /bitcoin
+ENTRYPOINT ["/entrypoint.sh"]