Add Dockerfile

Dockerfile

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+FROM debian:stretch
+
+ENV container docker
+ENV LC_ALL C
+ENV DEBIAN_FRONTEND noninteractive
+
+COPY container.target /etc/systemd/system/container.target
+
+RUN apt update && \
+    apt install -y systemd python && \
+    ln -sf /etc/systemd/system/container.target /etc/systemd/system/default.target && \
+    ln -sf /lib/systemd/systemd /sbin/init && \
+    apt-get clean && \
+    && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+ENTRYPOINT ["/sbin/init"]
+
+CMD ["--log-level=info"]
+
+STOPSIGNAL SIGRTMIN+3

container.target

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+[Unit]
+Description=Special target for running systemd in docker containers