Add script to facilitate loading addons

Dockerfile

@@ -1,10 +1,26 @@
 FROM ubuntu
+
+# Install required software and srb2kart
 RUN apt update && apt install -y software-properties-common
 RUN add-apt-repository -y ppa:kartkrew/srb2kart && apt update && apt install -y srb2kart
+
+# Setup volumes
 VOLUME /config
 VOLUME /addons
 VOLUME /data
+
+# Symlink for config
 RUN ln -sf /config/kartserv.cfg /usr/games/SRB2Kart/kartserv.cfg && ln -sf /addons /usr/games/SRB2Kart/addons
+
+# Expose network port
 EXPOSE 5029/udp
+
+# Copy bash script and fix execute permission
+COPY srb2kart.sh /usr/bin/srb2kart.sh
+RUN chmod a+x /usr/bin/srb2kart.sh
+
+# Set working directory
 WORKDIR /usr/games/SRB2Kart
-CMD /usr/games/SRB2Kart/srb2kart -dedicated -config kartserv.cfg -home /data
+
+# Run script
+ENTRYPOINT srb2kart.sh

srb2kart.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+cd /usr/games/SRB2Kart || exit
+
+ADDONS=$(ls /addons)
+
+if [ -z "$ADDONS" ]; then
+    /usr/games/SRB2Kart/srb2kart -dedicated -config kartserv.cfg -home /data "$@"
+    exit
+fi
+
+/usr/games/SRB2Kart/srb2kart -dedicated -config kartserv.cfg -home /data "$@" -file "$ADDONS"