Moved all config to .env file; updated README

forge/.env.example

@@ -1,4 +1,15 @@
+# Build arguments
 MC_VERSION=
 FORGE_VERSION=
+
+# Environment variables
 XMS=4
 XMX=4
+
+# Mountpoints
+CONFIG_DIR=
+MODS_DIR=
+WORLDS_DIR=
+
+# Other
+PORT=25565

forge/Dockerfile

@@ -11,11 +11,13 @@ RUN mkdir worlds config
 # Download installer jar
 ADD "https://files.minecraftforge.net/maven/net/minecraftforge/forge/${MC_VERSION}-${FORGE_VERSION}/forge-${MC_VERSION}-${FORGE_VERSION}-installer.jar" installer.jar
 
-# Install forge, rename forge jar & remove installer
+# Install forge & remove installer
 RUN java -jar installer.jar server --installServer && \
-mv forge-${MC_VERSION}-${FORGE_VERSION}.jar forge.jar && \
 rm installer.jar installer.jar.log
 
+# Forge doesn't use one single name, so this is needed to know the name of the executable
+ENV FORGE_JAR="forge-${MC_VERSION}-${FORGE_VERSION}.jar"
+
 # Store the cache in an anonymous volume, which means it won't get stored in the other volumes
 VOLUME /mc/config/cache
 
@@ -50,6 +52,6 @@ java \
 -XX:MaxTenuringThreshold=1 \
 -Dusing.aikars.flags=https://mcflags.emc.gs \
 -Daikars.new.flags=true \
--jar forge.jar \
+-jar "$FORGE_JAR" \
 --universe /mc/worlds \
 --nogui

forge/docker-compose.yml

@@ -16,8 +16,8 @@ services:
             - XMS
             - XMX
         ports:
-            - '25565:25565'
+            - '$PORT:25565'
         volumes:
-            - '/data/mc/forge/config:/mc/config'
-            - '/data/mc/forge/mods:/mc/config/mods'
-            - '/data/mc/forge/worlds:/mc/worlds'
+            - '$CONFIG_DIR:/mc/config'
+            - '$MODS_DIR:/mc/config/mods'
+            - '$WORLDS_DIR:/mc/worlds'