use v1beta2 as the storage version of PingSource (#4750)

- flip storage version to v1beta2 in PingSource CRD
- add post-install job to migrate existing PingSource objects to v1beta2

config/core/resources/pingsource.yaml

@@ -184,7 +184,7 @@ spec:
   - <<: *version
     name: v1beta1
     served: true
-    storage: true
+    storage: false
     schema:
       openAPIV3Schema:
         type: object
@@ -323,7 +323,7 @@ spec:
   - <<: *version
     name: v1beta2
     served: true
-    storage: false
+    storage: true
     schema:
       openAPIV3Schema:
         type: object

config/post-install/clusterrole.yaml

@@ -35,9 +35,7 @@ rules:
   - apiGroups:
       - "sources.knative.dev"
     resources:
-      - "sinkbindings"
-      - "apiserversources"
-      - "containersources"
+      - "pingsources"
     verbs:
       - "get"
       - "list"

config/post-install/storage-version-migrator.yaml

@@ -15,7 +15,12 @@
 apiVersion: batch/v1
 kind: Job
 metadata:
-  name: storage-version-migration
+  # Adding a prefix to avoid naming conflict with previous version's post-install jobs,
+  # we cannot use `generateName` here as it's not supported by `kubectl apply -f`
+  #
+  # If `ttlSecondsAfterFinished` feature gate becomes generally available in the future,
+  # we can rely on that and keep using the same Job name.
+  name: v0.21-storage-version-migration
   namespace: knative-eventing
   labels:
     app: "storage-version-migration"
@@ -37,6 +42,4 @@ spec:
         - name: migrate
           image: ko://knative.dev/eventing/vendor/knative.dev/pkg/apiextensions/storageversion/cmd/migrate
           args:
-            - "sinkbindings.sources.knative.dev"
-            - "apiserversources.sources.knative.dev"
-            - "containersources.sources.knative.dev"
+            - "pingsources.sources.knative.dev"