Add ADMIN_PASSWORD env variable

# Motivations
Being able to configure the admin password would be quite helpful

# Modifications
- Add `ADMIN_PASSWORD` to the list of environment variables, which adds `--adminpassword` to the server arguments

scripts/start.sh

@@ -24,6 +24,10 @@ if [ -n "${SERVER_PASSWORD}" ]; then
     STARTCOMMAND="${STARTCOMMAND} -serverpassword=${SERVER_PASSWORD}"
 fi
 
+if [ -n "${ADMIN_PASSWORD}" ]; then
+    STARTCOMMAND="${STARTCOMMAND} -adminpassword=${ADMIN_PASSWORD}"
+fi
+
 if [ "${MULTITHREADING}" = true ]; then
     STARTCOMMAND="${STARTCOMMAND} -useperfthreads -NoAsyncLoadingThread -UseMultithreadForDS"
 fi