Add config and service files

root/etc/cont-init.d/30-config

@@ -0,0 +1,19 @@
+#!/usr/bin/with-contenv bash
+
+# make our folders
+mkdir -p \
+	/config/.minetest/games \
+	/config/.minetest/mods \
+	/config/.minetest/main-config
+
+if [ ! -f "/config/.minetest/main-config/minetest.conf" ]; then
+cp /defaults/minetest.conf /config/.minetest/main-config/minetest.conf
+fi
+
+if [ ! -d "/config/.minetest/games/minimal" ]; then
+cp -pr /defaults/games/* /config/.minetest/games/
+fi
+
+# permissions
+chown -R abc:abc \
+	/config

root/etc/services.d/minetest/run

@@ -0,0 +1,18 @@
+#!/usr/bin/with-contenv bash
+
+# predefine some variables
+world_part="--world "
+# shellcheck disable=SC2154
+world_set=$world
+
+# set world_string variable to use user-defined world or default world.
+if [ -z "$world" ]; then
+world_string=" "
+else
+world_string=$world_part$world_set
+fi
+
+# shellcheck disable=SC2086
+exec \
+	s6-setuidgid abc minetestserver $world_string \
+	--config /config/.minetest/main-config/minetest.conf --port 30000