support loading DAG definitions from GCS buckets

[thesuperzapper]

Checks

• I have checked for existing issues.
• This report is about the user-community Airflow Helm Chart.

Motivation

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

This is similar to how we are proposing support for S3 buckets in #249.

Alternatively, we could use a non-sync approach by using Google's GCS FUSE to transparently mount the bucket as a filesystem folder.

Implementation

No response

Are you willing & able to help?

• I am able to submit a PR!
• I can help test the feature!