Add build directive to docker-compose for rego-tunnel

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

apps/rego-tunnel/docker-compose.yml

@@ -3,6 +3,9 @@ version: '3.9'
 services:
   rego-tunnel:
     container_name: rego-tunnel
+    build:
+      context: ./build
+      dockerfile: Dockerfile
     image: rego-windows:latest
     restart: unless-stopped
     devices: