client: lib_env: allow non-root system user; print warning

Needed for CI.

client/src/docker/lib/internal/lib_env.bash

@@ -2,7 +2,7 @@
 
 # docker-finance | modern accounting for the power-user
 #
-# Copyright (C) 2021-2025 Aaron Fiore (Founder, Evergreen Crypto LLC)
+# Copyright (C) 2021-2026 Aaron Fiore (Founder, Evergreen Crypto LLC)
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -31,7 +31,9 @@ source "${DOCKER_FINANCE_CLIENT_REPO}/container/src/finance/lib/internal/lib_uti
 #
 
 if [ $UID -lt 1000 ]; then
-  lib_utils::die_fatal "Do not run as root or system user!"
+  [ $UID -eq 0 ] \
+    && lib_utils::die_fatal "Cannot run as root!" \
+    || lib_utils::print_warning "Running as system user"
 fi
 
 # Dependencies