add update docker script

update-docker/README.md

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+# 🛠️ Maintenance Script for Docker Containers
+
+Automates updating your Docker containers on Debian-based systems by pulling the latest images, restarting services, and cleaning up unused resources.
+
+---
+
+## 🚀 Installation, Setup & Running
+
+Download the maintenance script to your Docker project directory:
+
+```bash
+# cd into the docker folder
+wget -qO update-docker.sh https://gitea.featherer.xyz/nono/update-docker/raw/branch/main/update-docker.sh
+source update-docker.sh
+```
+
+Or, when run locally (replace the ip address to your own)
+
+```bash
+# cd into the docker folder
+wget -qO update-docker.sh http://10.1.0.102:3000/nono/update-docker/raw/branch/main/update-docker.sh
+source update-docker.sh
+```
+
+---
+
+## 🔄 What It Does
+
+1. **Updates system packages** 
+   Runs `apt update` and `apt upgrade -y` to ensure your host is up to date. 
+2. **Refreshes Docker services** 
+   Executes `docker-compose pull`, `docker-compose down`, and `docker-compose up -d` to fetch new images and restart containers. 
+3. **Cleans up unused resources** 
+   Calls `docker system prune -a -f` to remove dangling images, stopped containers, and unused networks. 
+4. **Verifies running containers** 
+   Lists active containers with `docker ps` so you can confirm everything is up and running.
+
+---
+
+## 📝 Prerequisites
+
+- **Debian-based OS** (e.g., Debian, Ubuntu) 
+- **Docker** & **Docker Compose** installed 
+- A user with **sudo** privileges or in the **docker** group