fix: use bind mount for instances in traefik compose

- Change from named volume instance_data to host bind mount
- Consistent with docker-compose.yml fix for clone mode

Refs: clone mode repo files not visible in containers

docker-compose.traefik.yml

@@ -93,7 +93,7 @@ services:
       AUTHENTIK_TOKEN_URL: ${AUTHENTIK_TOKEN_URL:-}
     volumes:
       - repo_data:/data/repos
-      - instance_data:/data/instances
+      - /data/instances:/data/instances
       - avatar_uploads:/app/uploads
       - /var/run/docker.sock:/var/run/docker.sock
     depends_on:
@@ -117,7 +117,6 @@ volumes:
   postgres_data:
   redis_data:
   repo_data:
-  instance_data:
   avatar_uploads:
 
 networks: