Yep I am using traefik -> nginx. I simply add the traefik tags to the nginx service. I didn’t include that in the example file to keep it simple.
As for the storage, I use SeaweedFS (has a CSI plugin, really cool, works well with nomad) but as a CSI volume it’s not suitable for backing postgres’ filesystem. The lookups are so noticeably slower that your Lemmy instance will be laggy. So I decided to use a normal host volume, so the DB writes to disk directly, and you can back that up to an S3-compatible storage with this (also cool). Could be SeaweedFS, AWS, Backblaze…
I think SeaweedFS is suitable for your pictrs storage though, be it through its S3 API (supported by pictrs) or through a SeaweedFS CSI volume that stores the files directly.
I hope that answers it! Do let me know what you end up with