Add image for zandronum

zandronum needs a set of packages that are outdated.

games/zandronum/Dockerfile

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+FROM --platform=$TARGETOS/$TARGETARCH debian:bookworm-slim
+
+RUN apt update && \
+    apt upgrade -y && \
+    apt install -y \
+        tini \
+        wget \
+        libsdl1.2debian \
+        libsdl2-2.0-0 
+
+RUN wget https://snapshot.debian.org/archive/debian/20190501T215844Z/pool/main/g/glibc/multiarch-support_2.28-10_amd64.deb && \
+    wget https://snapshot.debian.org/archive/debian/20141009T042436Z/pool/main/libj/libjpeg8/libjpeg8_8d1-2_amd64.deb && \
+    wget http://archive.ubuntu.com/ubuntu/pool/main/o/openssl/libssl1.1_1.1.0g-2ubuntu4_amd64.deb && \
+    apt install -y ./libjpeg8_8d1-2_amd64.deb ./multiarch-support_2.28-10_amd64.deb ./libssl1.1_1.1.0g-2ubuntu4_amd64.deb
+
+## add container user
+RUN   useradd -m -d /home/container -s /bin/bash container
+
+# Set up user and working directory
+USER container
+ENV USER=container HOME=/home/container
+WORKDIR /home/container
+
+# Set the stop signal
+STOPSIGNAL SIGINT
+
+# Copy and set up the entrypoint script
+COPY --chown=container:container ./entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+# Define entrypoint and command
+ENTRYPOINT ["/usr/bin/tini", "-g", "--"]
+CMD ["/entrypoint.sh"]

games/zandronum/entrypoint.sh

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+#!/bin/bash
+cd /home/container
+
+# Make internal Docker IP address available to processes.
+INTERNAL_IP=$(ip route get 1 | awk '{print $(NF-2);exit}')
+export INTERNAL_IP
+
+# Replace Startup Variables
+MODIFIED_STARTUP=$(echo -e $(echo -e ${STARTUP} | sed -e 's/{{/${/g' -e 's/}}/}/g'))
+echo -e ":/home/container$ ${MODIFIED_STARTUP}"
+
+# Run the Server
+eval ${MODIFIED_STARTUP}