SCP:SL, but in a dockerfile. The dockerfile requires config_gameplay.txt, config_remoteadmin.txt, and ReservedSlots.txt in the build directory, along with the scp_multiadmin.cfg attached to this gist. Add any SMod plugins to the "plugins" folder in the build directory.

Dockerfile

# AAAAAAAAA
FROM mono:latest

LABEL maintainer="frostbytes"

ENV STEAMAPPID 786920

ENV INSTALLDIR /home/scpsl
ENV STEAMCMDDIR ${INSTALLDIR}/steamcmd
ENV CONFIGDIR ${INSTALLDIR}/config
ENV PLUGINSDIR ${INSTALLDIR}/sm_plugins

# first, get steamcmd...
RUN set -x \
	&& apt-get update \
	&& apt-get install -y --no-install-recommends --no-install-suggests \
		lib32stdc++6 \
		lib32gcc1 \
		wget \
		ca-certificates \
    && useradd -m scpsl \
    && mkdir -p ${STEAMCMDDIR} \
    && cd ${STEAMCMDDIR} \
    && wget -qO- 'https://steamcdn-a.akamaihd.net/client/installer/steamcmd_linux.tar.gz' | tar zxf - \
    && apt-get clean autoclean \
    && apt-get autoremove -y \
    && rm -rf /var/lib/{apt,dpkg,cache,log}/

# install SCP Server
RUN ${STEAMCMDDIR}/steamcmd.sh \
        +login anonymous \
        +force_install_dir ${INSTALLDIR} \
        +app_update ${STEAMAPPID} -beta beta validate \
        +quit

# configure everything
RUN mkdir ${CONFIGDIR}

ADD ./scp_multiadmin.cfg ${INSTALLDIR}/scp_multiadmin.cfg
ADD ./config_gameplay.txt ${CONFIGDIR}/config_gameplay.txt
ADD ./config_remoteadmin.txt ${CONFIGDIR}/config_remoteadmin.txt
ADD ./ReservedSlots.txt ${CONFIGDIR}/ReservedSlots.txt

# copy plugins
ADD ./plugins/* ${PLUGINSDIR}

# chown everything in the scpsl install directory
RUN chown -R scpsl:scpsl ${INSTALLDIR}
RUN chown -R scpsl:scpsl ${CONFIGDIR}
RUN chown -R scpsl:scpsl ${STEAMCMDDIR}

USER scpsl

WORKDIR ${INSTALLDIR}

VOLUME ${CONFIGDIR}
VOLUME ${PLUGINSDIR}

ENTRYPOINT ${STEAMCMDDIR}/steamcmd.sh \
        +login anonymous \
        +force_install_dir ${INSTALLDIR} \
        +app_update ${STEAMAPPID} -beta beta validate \
        +quit \
    && mono ${INSTALLDIR}/MultiAdmin.exe

EXPOSE 7777/tcp
EXPOSE 7777/udp

scp_multiadmin.cfg

use_new_input_system: false
set_title_bar: false
config_location: ./config
max_memory: 4096
restart_low_memory_roundend: 1024
restart_low_memory: 256