Fix rego-tunnel docker-compose.json format and add build folder

- Convert environment from array to object format (runtipi requirement)
- Remove hardcoded KEY from docker-compose.json
- Add build folder with custom Dockerfile and rego scripts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/rego-tunnel/docker-compose.yml

@@ -1,9 +1,7 @@
-version: '3.9'
-
 services:
   rego-tunnel:
     container_name: rego-tunnel
-    image: dockurr/windows:latest
+    image: rego-windows:latest
     restart: unless-stopped
     devices:
       - /dev/kvm