make reviewer assignment global

[cgwalters]

https://github.com/bootc-dev/bootc/blob/main/.github/workflows/auto-review.yml needs to move into here so it's global across our repos.

[jeckersb]

👍 I noticed I wasn't getting assigned across everything this week, but still been trying to keep up with things even if the bot wasn't explicitly assigning it to me.