Use .env file for docker compose with all variables

.env.example

@@ -1,2 +1,14 @@
-STEAMUSER=id-not-email
-STEAMPASSWORD=password
+ARMA_BINARY=arma3server_x64
+ARMA_CDLC=
+ARMA_CONFIG=main.cfg
+ARMA_LIMITFPS=100
+ARMA_PROFILE=main
+ARMA_WORLD=empty
+HEADLESS_CLIENTS=0
+MODS_LOCAL=true
+MODS_PRESET=
+PORT=2302
+STEAM_BRANCH=public
+STEAM_BRANCH_PASSWORD=
+STEAM_PASSWORD=password
+STEAM_USER=id-not-email

.gitignore

@@ -0,0 +1 @@
+.env

README.md

@@ -30,7 +30,7 @@ An Arma 3 Dedicated Server. Updates to the latest version every time it is resta
 
 Use the docker-compose.yml file inside a folder. It will automatically create 4 folders in which the missions, configs, mods and servermods can be loaded.
 
-Copy the `.env.example` file to `.env`, containing at least `STEAMUSER` and `STEAMPASSWORD`.
+Copy the `.env.example` file to `.env`, containing at least `STEAM_USER` and `STEAM_PASSWORD`.
 
 Use `docker-compose start` to start the server.
 

docker-compose.yml

@@ -9,8 +9,5 @@ services:
       - './configs:/arma3/configs'
       - './mods:/arma3/mods'
       - './servermods:/arma3/servermods'
-    environment:
-      - ARMA_CONFIG=main.cfg
-      - STEAM_USER=${STEAMUSER}
-      - STEAM_PASSWORD=${STEAMPASSWORD}
+    env_file: .env
     restart: unless-stopped