We are successfully hosting discourse on helm with our own docker image since some months now.
(before we were using our own image as well, with compose)
And it is with s3/minio support.
https://forge.liiib.re/indiehost/tech/infrastructure/charts/-/tree/master/discourse
(but it definitely lack documentation, and “openess” to open accounts and contribute.
If there is demand, here or in pm, we can open 
)
@pfaffman if you find happy people that are willing to support your time, we’d be happy to collaborate!
We are hosting discourse for some small communities, mainly in France, part of the common movement.
(Like https://forum.chatons.org/ is the biggest one we host pro bono)