refactor: remove explicit StorageClass selection

Previously PVCs need to define storage class explicitly because if
a PVC was created before Longhorn is ready, it will stay pending forever
until we delete and recreate it (ArgoCD didn't have sync wave for
ApplicationSet back then).

Kubernetes 1.28 has retroactive assignment of a default StorageClass for
existing unbound persistent volume claims without any storage class assigned.

https://kubernetes.io/blog/2023/08/15/kubernetes-v1-28-release/#automatic-retroactive-assignment-of-a-default-storageclass-graduates-to-stable

apps/matrix/values.yaml

@@ -44,7 +44,6 @@ dendrite:
       addresses:
         - nats://matrix-nats:4222
   persistence:
-    storageClass: longhorn
     logs:
       capacity: 1Gi
     media:
@@ -63,7 +62,6 @@ dendrite:
         postgresqlPassword: dendrite
     persistence:
       enabled: true
-      storageClass: longhorn
       accessModes:
         - ReadWriteOnce
       size: 5Gi

platform/gitea/values.yaml

@@ -24,8 +24,3 @@ gitea:
         ROOT_URL: https://git.khuedoan.com
       webhook:
         ALLOWED_HOST_LIST: private
-  persistence:
-    storageClass: longhorn
-  postgresql:
-    persistence:
-      storageClass: longhorn

platform/registry/values.yaml

@@ -42,6 +42,5 @@ docker-registry:
   persistence:
     enabled: true
     size: 10Gi
-    storageClass: longhorn
   garbageCollect:
     enabled: true

platform/tekton-pipelines/workflows/master.yaml

@@ -43,7 +43,6 @@ spec:
     - name: shared-data
       volumeClaimTemplate:
         spec:
-          storageClassName: longhorn
           accessModes:
             - ReadWriteOnce
           resources:

platform/tekton-pipelines/workflows/pull-request.yaml

@@ -36,7 +36,6 @@ spec:
     - name: shared-data
       volumeClaimTemplate:
         spec:
-          storageClassName: longhorn
           accessModes:
             - ReadWriteOnce
           resources:

platform/vault/templates/cr.yaml

@@ -260,7 +260,6 @@ kind: PersistentVolumeClaim
 metadata:
   name: vault-file
 spec:
-  storageClassName: longhorn
   accessModes:
     - ReadWriteOnce
   resources: