PRs in bazel-contrib/bazel-docs are not triggering Mintlify previews

[nikki-ef]

For #438, no Mintlify preview was generated.

It might have something to do with Mintlify settings that instruct it to generate previews for branches specifically named main and pr-*. Maybe expanding this pattern would generate previews for all PRs in bazel-contrib/bazel-docs.

[fweikert]

cc @alan707 - I could only find settings for "main", which I assume is for the actual deployment. Not sure where the preview is being configured.

[fweikert]

Apparently Mintlify ignores PRs from forks - I only saw previews for PRs from another branch in bazel-contrib/bazel-docs into main. Unfortunately I cannot find a setting to change this :(