BUG: secrets sync script doesn't work without `FOURNOS_NAMESPACE`

[kpouget]

$ unset FOURNOS_NAMESPACE
$ hacks/sync_vault_secrets.py
Traceback (most recent call last):
  File "/var/home/kpouget/openshift/fournos/hacks/sync_vault_secrets.py", line 50, in <module>
    from fournos.settings import settings
  File "/var/home/kpouget/openshift/fournos/fournos/settings.py", line 27, in <module>
    settings = Settings()
  File "/var/home/kpouget/openshift/fournos/.venv/lib64/python3.14/site-packages/pydantic_settings/main.py", line 242, in __init__
    super().__init__(**__pydantic_self__.__class__._settings_build_values(sources, init_kwargs))
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/var/home/kpouget/openshift/fournos/.venv/lib64/python3.14/site-packages/pydantic/main.py", line 250, in __init__
    validated_self = self.__pydantic_validator__.validate_python(data, self_instance=self)
pydantic_core._pydantic_core.ValidationError: 1 validation error for Settings
namespace
  Field required [type=missing, input_value={'secrets_namespace': 'psap-secrets'}, input_type=dict]
    For further information visit https://errors.pydantic.dev/2.12/v/missing

and works well when set

issue comes from the import of fournos/settings.py

[kpouget]

I think we can have another script which sets PSAP values:

VAULT_SECRET_PATH=selfservice/psap
VAULT_ADDR=https://vault.ci.openshift.org
FOURNOS_SECRETS_NAMESPACE=psap-secrets

so that we just have to set the VAULT_TOKEN

[kpouget]

fixed in #68