Stash Helm upgrade not working because of removed PodSecurityPolicy feature

[ZeiP]

I have Stash v2023.05.31 installed through Helm. My Kubernetes environment is upgraded by DigitalOcean and is currently in 1.26.13-do.0, which unfortunately already has had the PodSecurityPolicy feature removed (which was removed in 1.25).

I tried to figure out how to repair my installation based on, for example, the Helm instructions for this kind of case, but they seem to rely on there being a successor for the API, while PodSecurityPolicy apparently doesn't have a clear successor. stashed/installer#278 seems to have something to do with this, but I can't really figure out how to fix it. Would it be possible to get some guidance from you on how I could get my setup upgraded? IMO this would also be something that'd be good to have in the upgrade instructions, as I suppose not everyone controls their cluster upgrades (and maybe forgets Helm upgrades for a while).

The actual output I'm getting is
Error: UPGRADE FAILED: current release manifest contains removed kubernetes api(s) for this kubernetes version and it is therefore unable to build the kubernetes objects for performing the diff. error from kubernetes: unable to recognize "": no matches for kind "PodSecurityPolicy" in version "policy/v1beta1"

Additionally I'm getting these errors for example when applying new (unrelated) configuration, not sure if that also has to do with this:

> E0401 23:11:32.027784  305132 memcache.go:287] couldn't get resource list for repositories.stash.appscode.com/v1alpha1: the server is currently unable to handle the request
> E0401 23:11:32.041431  305132 memcache.go:287] couldn't get resource list for admission.stash.appscode.com/v1alpha1: the server is currently unable to handle the request
> E0401 23:11:32.054092  305132 memcache.go:287] couldn't get resource list for admission.stash.appscode.com/v1beta1: the server is currently unable to handle the request
> E0401 23:11:32.109729  305132 memcache.go:121] couldn't get resource list for admission.stash.appscode.com/v1beta1: the server is currently unable to handle the request
> E0401 23:11:32.160312  305132 memcache.go:121] couldn't get resource list for repositories.stash.appscode.com/v1alpha1: the server is currently unable to handle the request
> E0401 23:11:32.211513  305132 memcache.go:121] couldn't get resource list for admission.stash.appscode.com/v1alpha1: the server is currently unable to handle the request

[MrCoffey]

I have the same issue when trying to install the latest version v2024.2.13 I think the PodSecurityPolicy has to be upgraded, it's no longer supported by Kubernetes.

unable to build Kubernetes objects from current release manifest: resource mapping not found for name: "privileged" namespace: "" from "": no matches for kind "PodSecurityPolicy" in version "policy/v1beta1"