CI not usable in PRs

[h-vetinari]

Seems the tokens are only usable on main? In PRs, we get

HTTPError: 401 Client Error: Unauthorized for url: https://api.github.com/orgs/conda-forge/teams/core/members?per_page=100
HTTPError: 401 Client Error: Unauthorized for url: https://api.github.com/orgs/conda-forge/teams/emeritus-core/members?per_page=100

[h-vetinari]

This looks relevant: conda/governance#313

Presumably we can pick up similar changes here, once that's in.