Properly expose UDP port of minetest

minetest/Dockerfile

@@ -11,9 +11,8 @@ RUN apt-get update -y \
 # Create all folders
 RUN mkdir -p /root/.minetest/textures /root/.minetest/worlds
 
-EXPOSE 30000
+EXPOSE 30000/udp
 
 # Add entrypoint
 COPY entrypoint.sh /
 ENTRYPOINT ["/entrypoint.sh"]
-