Support `_environment-<profile>.local` for profile-specific secrets

[cderv]

Discussed in https://github.com/orgs/quarto-dev/discussions/14231

^{Originally posted by alyst March 19, 2026}

Description

My use case is using per-profile credentials for the notebook data retrieval.

According to Quarto docs, it currently supports:

_environment
_environment-<profile>
_environment.local

But it does not mention _environment-<profile>.local files. Supporting them will streamline things a lot.