Switched config to environment variables

fabric/.env.example

@@ -0,0 +1 @@
+FABRIC_VERSION=

fabric/docker-compose.yml

@@ -4,8 +4,8 @@ services:
         build:
             context: .
             args:
-                - 'FABRIC_VERSION=0.6.1.51'
+                - 'FABRIC_VERSION=${FABRIC_VERSION}'
-        image: 'mc-fabric-server:latest'
+        image: 'mc-fabric-server:${FABRIC_VERSION}'
 
         restart: 'unless-stopped'
         stdin_open: true

papermc/.env.example

@@ -0,0 +1,2 @@
+MC_VERSION=
+PAPERMC_VERSION=

papermc/docker-compose.yml

@@ -1,13 +1,13 @@
-version: "3.5"
+version: '3.5'
 services:
     papermc:
         build:
             context: .
             dockerfile: Dockerfile
             args:
-                - 'MC_VERSION='
+                - 'MC_VERSION=${MC_VERSION}'
-                - 'PAPERMC_VERSION='
+                - 'PAPERMC_VERSION=${PAPERMC_VERSION}'
-        image: 'mc-papermc-server:latest'
+        image: 'mc-papermc-server:${MC_VERSION}-${PAPERMC_VERSION}'
 
         restart: unless-stopped
         stdin_open: true