n8n: refactor environmentfile (#6297)

* n8n: add config path

* n8n: refactor servicefile to seperate env

* n8n: refactor envfile

* Update n8n.sh

* Update n8n.json

---------

Co-authored-by: Slaviša Arežina <58952836+tremor021@users.noreply.github.com>

install/n8n-install.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
 # Copyright (c) 2021-2025 tteck
-# Author: tteck (tteckster)
+# Author: tteck (tteckster) | Co-Author: CrazyWolf13
 # License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
 # Source: https://n8n.io/
 
@@ -26,13 +26,22 @@ $STD npm install --global n8n
 msg_ok "Installed n8n"
 
 msg_info "Creating Service"
+HOST_IP=$(hostname -I | awk '{print $1}')
+mkdir -p /opt
+cat <<EOF >/opt/n8n.env
+N8N_SECURE_COOKIE=false
+N8N_PORT=5678
+N8N_PROTOCOL=http
+N8N_HOST=$HOST_IP
+EOF
+
 cat <<EOF >/etc/systemd/system/n8n.service
 [Unit]
 Description=n8n
 
 [Service]
 Type=simple
-Environment="N8N_SECURE_COOKIE=false"
+EnvironmentFile="/opt/n8n.env"
 ExecStart=n8n start
 [Install]
 WantedBy=multi-user.target