Just use the anonymous steam user.

README.md

@@ -5,12 +5,8 @@ A Linux DayZ server in a Docker container.
 Edit docker-compose.yml and set the variables:
 
 ```
-- STEAMLOGIN=yourSteamLogin
 - SERVERNAME="DayZ on Linux for Linux"
 ```
-The steam login is necessary as the server files require ownership
-of the game.
-
 Build the container, run it, tail the logs:
 ```
 docker-compose build

docker-compose.yml

@@ -19,6 +19,5 @@ services:
       - serverfiles:/home/user/serverfiles
       - serverprofile:/home/user/serverprofile
     environment:
-      - STEAMLOGIN=anonymous
 #     Escape any forwardslashes: SERVERNAME="My thing \/ My other thing"
       - SERVERNAME=DayZ on Linux for Linux

server.sh

@@ -4,11 +4,7 @@
 ulimit -c 0
 
 # This script will take environment variables and put them into the files the script expects.
-if ! grep STEAMLOGIN .steamlogin
-then
-  echo "Setting the STEAMLOGIN..."
-  echo "steamlogin=${STEAMLOGIN}" > .steamlogin
-fi
+echo "steamlogin=anonymous" > .steamlogin
 
 # Do something with SERVERNAME="DayZ on Linux for Linux"
 if ! grep SERVERNAME serverDZ.cfg