We need ruamel-yaml pkg in the binderhub-service image because it gets used by binderhub_config.py.
Prior to this, it get installed via jupyterhub (via jupyter-telemetry), but since jupyterhub 5, (the version that gets installed with this chart), jupyter-telemetry was replaced https://github.com/jupyterhub/jupyterhub/pull/4807, so we need be explicitly install it.
We need ruamel-yaml pkg in the binderhub-service image because it gets used by binderhub_config.py.
Prior to this, it get installed via jupyterhub (via jupyter-telemetry), but since jupyterhub 5, (the version that gets installed with this chart), jupyter-telemetry was replaced https://github.com/jupyterhub/jupyterhub/pull/4807, so we need be explicitly install it.