This repo contains a simple workflow to automate adding any assigned issue or PR across any repository to a personal project board (not a repository project board).
The items are added with "No status" as setting a status requires some overkill usage of the GraphQL API.
You should just need to set the right permissions on a "classic" GH token and get the correct project number to write to (note: this is mutable if you delete other projects).
This needs to run on a schedule, and it will loop over the last day's worth of issues to add them to the board.