Initialize project with DIUN Webhook Dashboard: core Go app, Docker setup, static assets, and documentation.

README.md

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+# DIUN Webhook Dashboard
+
+A tiny Go web app that receives [DIUN](https://crazymax.dev/diun/) webhook events and shows the latest image updates in a simple UI.
+
+- Receives DIUN webhooks at `POST /webhook`
+- Serves a minimal dashboard at `/`
+- Exposes a read-only API at `GET /api/updates`
+- Stores events in memory (ephemeral)
+
+## Quick start
+
+### Run locally (Go 1.26+)
+```bash
+go run .
+# open http://localhost:8080
+```
+
+### Docker
+```bash
+docker build -t diun-webhook-dashboard .
+docker run --rm -p 8080:8080 diun-webhook-dashboard
+# open http://localhost:8080
+```
+
+### Docker Compose
+```bash
+docker compose up -d
+# open http://localhost:8080
+```
+
+## DIUN configuration example
+Configure DIUN to send webhooks to this app. Example (YAML):
+
+```yaml
+notif:
+  webhook:
+    enable: true
+    endpoint: http://your-host-or-ip:8080/webhook
+```
+
+Expected JSON payload (simplified):
+```json
+{
+  "image": "library/nginx",
+  "tag": "1.27.0",
+  "status": "new",
+  "time": "2026-02-23T16:00:00Z"
+}
+```
+
+## API
+- `POST /webhook` — accept a DIUN event JSON body.
+- `GET /api/updates` — return the latest events as a JSON object keyed by image name.
+- `/` — static HTML dashboard.
+
+Note: data is only kept in-memory and will be reset on restart.
+
+## Development
+- Code: `main.go`
+- Static assets: `static/`
+- Container image: `Dockerfile`
+
+## Production notes
+- Behind a reverse proxy, ensure the app is reachable at `/webhook` from DIUN.
+- Persistence is not implemented; hook up a store (e.g., BoltDB/Redis/Postgres) if you need durability.
+- Consider adding auth, rate limiting, or a secret/token on the webhook endpoint if exposed publicly.
+
+## License
+MIT — see `LICENSE`.