* Use providers.provider for modifiedFile
This defers the looking up of modifiedFiles until it is used. It
also allows other tasks to be ran from the non-primary worktree.
Working in another worktree is essential for Antora which will clone
each branch/tag into a new worktree to process it.
* Move Asdiidoc Attributes to antora.yml
This ensures the attributes are available for the docs-build branch
as well.
* Fix GitHub Actions Permissions
The permission actions: write is necessary so that pushes to branches
and tags can invoke the deploy-docs workflow on the docs-build branch
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