Add GVM (OpenVAS) add-on initialization script

- Create a new script `run.sh` for initializing and launching the GVM add-on.
- Ensure required environment variables `USERNAME` and `PASSWORD` are set.
- Set the timezone if the `TZ` variable is provided.
- Initialize a data directory at `/data` if it does not exist.
- Launch the GVM service and log output to a file.

fix(sonarqube): fix config.json

gvm/README.md

@@ -0,0 +1,63 @@
+# Home Assistant Add-on: GVM (OpenVAS) 
+
+![Supports amd64 Architecture](https://img.shields.io/badge/amd64-yes-green.svg)
+![Supports aarch64 Architecture](https://img.shields.io/badge/aarch64-yes-green.svg)
+
+This Home Assistant add-on deploys the GVM (OpenVAS) vulnerability scanner inside a Docker container.
+
+## 🚀 Features
+
+- Full GVM Scanner in a managed container
+- Web UI available on port `9392`
+- Username and password configurable from UI
+
+## ⚙️ Configuration
+
+Example `options` in `config.json`:
+
+```json
+{
+    "username": "admin",
+    "password": "changeme",
+    "ui_port": 9392,
+    "TZ": "Europe/Rome",
+    "HTTPS": "false",
+    "SSHD": "true",
+    "DB_PASSWORD": "changeme"
+}
+```
+
+## 🌐 Access
+
+Once installed, access the GVM web interface at:
+
+`http://<your-home-assistant-ip>:9392`
+
+## 📂 Repository Structure
+
+```bash
+gvm/
+├── CHANGELOG.md       # Changelog for the add-on
+├── config.json        # Add-on configuration definition
+├── Dockerfile         # Dockerfile for the GVM container
+├── icon.png           # Icon for the add-on
+├── logo.png           # Logo for the add-on
+├── README.md          # This file
+└── run.sh             # Startup script for GVM
+```
+
+## 🛡 Security
+
+> ⚠️ Always use strong passwords and ensure secure network settings, especially for database connections.
+
+---
+
+Made with ❤️ for automation and resilience.
+
+[semver]: http://semver.org/spec/v2.0.0.html
+[aarch64-shield]: https://img.shields.io/badge/aarch64-yes-green.svg
+[amd64-shield]: https://img.shields.io/badge/amd64-yes-green.svg
+[armv7-shield]: https://img.shields.io/badge/armv7-yes-green.svg
+[i386-shield]: https://img.shields.io/badge/i386-yes-green.svg
+[repository-badge]: https://img.shields.io/badge/Add%20repository%20to%20my-Home%20Assistant-41BDF5?logo=home-assistant&style=for-the-badge
+[repository-url]: https://my.home-assistant.io/redirect/supervisor_add_addon_repository/?repository_url=https%3A%2F%2Fgithub.com%2Fmartemme%2FHomeAssistantAddons