Describe the bug

The new runtime configuration feature attempts to write configuration changes back to configuration.yml on the disk. However, in our standard docker-compose setup, the configuration file is mounted as read-only (:ro).

Hence when we tried to write new config into file, we got error: memmachine.server.api_v2.config_service - Failed to persist configuration to file: [Errno 30] Read-only file system: 'configuration.yml'

And the conf will be lost when the service restarts.

Steps to reproduce

1. Start the MemMachine service using the standard Docker setup:

  docker-compose up -d

2. Call the runtime configuration API to modify a setting. For example, using curl to update memory capacity:

curl -X PUT http://localhost:8000/config/memory/episodic \
  -H "Content-Type: application/json" \
  -d '{"short_term_memory": {"message_capacity": 100}}'

3. Observe the API response and container logs.

Expected behavior

Persist the changed configs into configuration.yml

Environment

memmachine version: ca2dbf7

Additional context

No response