Sync GitHub labels from CSV file

The following looks like an interesting option for managing GitHub labels declaratively: https://github.com/micnncim/action-label-syncer

(if only there was some other declarative language able to manage GitHub repos...)

Start by reviewing the linked action-label-syncer project and the issue's proposal to manage GitHub labels from a CSV file. The issue does not identify Bicep files, tests, an entry point, or acceptance criteria, so the intended behavior and definition of done need to be established first.

Written by the indexing model from the issue text.