Description of problem:

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

• Checkout the rhdh-chart at the latest tag and deploy the Chart:

  git clone https://github.com/redhat-developer/rhdh-chart.git -b 1.4.1 && cd rhdh-chart
  helm dependency update charts/backstage 
  helm upgrade --install my-backstage-1 charts/backstage --set route.enabled=false 
  

• Now switch to the head of the release-1.4 branch and upgrade the Chart:

  git switch release-1.4
  helm dependency update charts/backstage
  helm upgrade --install my-backstage-1 charts/backstage --set route.enabled=false
  

=> Failure to upgrade

Actual results:

$ helm upgrade --install my-backstage-1 charts/backstage --set route.enabled=false
Error: UPGRADE FAILED: cannot patch "my-backstage-1-dynamic-plugins-root" with kind PersistentVolumeClaim: PersistentVolumeClaim "my-backstage-1-dynamic-plugins-root" is invalid: spec: Forbidden: spec is immutable after creation except resources.requests for bound claims
  core.PersistentVolumeClaimSpec{
        ... // 2 identical fields
        Resources:        {Requests: {s"storage": {i: {...}, s: "5Gi", Format: "BinarySI"}}},
        VolumeName:       "pvc-9b5b33f1-a199-4367-a207-7bbff34fb51b",
-       StorageClassName: &"local-path",
+       StorageClassName: nil,
        VolumeMode:       &"Filesystem",
        DataSource:       nil,
        DataSourceRef:    nil,
  }

Expected results:

The previous 1.4.1 Helm Release should be successfully upgraded to the latest 1.4 commit.

Reproducibility (Always/Intermittent/Only Once):

Always

Build Details:

Additional info (Such as Logs, Screenshots, etc):

A possible workaround is to set in your values file the dynamicPlugins.cache.volumeClaimSpec.storageClassName fields to the default storage class available in the cluster.