feat: add htpasswd support to registry

- Add Dockerfile with apache2-utils
- Update docker-compose to use local build
- Keep setup minimal while enabling password management

docker-compose.yml

@@ -2,7 +2,7 @@ version: '3.8'
 
 services:
   registry:
-    image: registry:2
+    build: .
     container_name: registry
     restart: unless-stopped
     expose: