Feat: lab0 done

Dockerfile

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+FROM docker.io/library/ubuntu:24.04
+
+ENV container=docker \
+    DEBIAN_FRONTEND=noninteractive
+
+COPY ./root /
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+      sudo systemd findutils \
+      iproute2 iputils-ping wireguard wireguard-tools \
+      openssh-server #&& \
+    # apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+    # as the spec says
+
+RUN find /etc/systemd/system /lib/systemd/system \
+      -path '*.wants/*' \
+      -not -name '*journald*' \
+      -not -name '*systemd-tmpfiles*' \
+      -not -name '*systemd-user-sessions*' \
+      -print0 | xargs -0 rm -vf
+
+RUN systemctl enable \
+      wg-quick@wg0.service \
+      ssh.socket
+
+RUN useradd -m judge -s /bin/bash
+
+VOLUME ["/sys/fs/cgroup"]
+ENTRYPOINT ["/lib/systemd/systemd"]
+CMD []