Currently we support git-sync with the dags.gitSync.* values, but we can probably do something similar for S3 buckets. That is, let people store their dags in a folder on an S3 bucket.

Possibly we should generalise this to include GCS and ABS, but these probably have different libraries needed to do the sync (so might need to be separate features/containers). However, clearly S3 is the best place to start, as it's the most popular.