fix: proper YAML config with printf

- Use printf for proper YAML formatting
- Add explicit config path to command
- Add config directory creation step

docker-compose.yml

@@ -11,6 +11,7 @@ services:
       - registry-data:/var/lib/registry
     networks:
       - registry-network
+    command: ["/etc/docker/registry/config.yml"]
 
 networks:
   registry-network: