For containerized deployment, is it possible to use GCS or S3 or some sort of storage bucket instead of an external mounted volume?

https://github.com/s3fs-fuse/s3fs-fuse is one way!

lol I should’ve just said GCS since that’s what we use

https://github.com/gaul/s3proxy#supported-storage-backends looks like it'd do it as well 🤷