preview env: increase default VM volume size from 30Gi to 50Gi

In order to test workspace classes feature, we need to have at least two
workspace classes, one is 30Gi disk size, the other one is 50Gi disk
size.

Signed-off-by: JenTing Hsiao <[email protected]>

.werft/vm/manifests.ts

@@ -39,7 +39,7 @@ kind: VirtualMachine
 metadata:
   namespace: ${namespace}
   annotations:
-    harvesterhci.io/volumeClaimTemplates: '[{"metadata":{"name":"${claimName}","annotations":{"harvesterhci.io/imageId":"default/image-tfmk6"}},"spec":{"accessModes":["ReadWriteOnce"],"resources":{"requests":{"storage":"200Gi"}},"volumeMode":"Block","storageClassName":"longhorn-image-tfmk6-onereplica"}},{"metadata":{"name":"${storageClaimName}"},"spec":{"accessModes":["ReadWriteOnce"],"resources":{"requests":{"storage":"30Gi"}},"volumeMode":"Block","storageClassName":"longhorn"}}]'
+    harvesterhci.io/volumeClaimTemplates: '[{"metadata":{"name":"${claimName}","annotations":{"harvesterhci.io/imageId":"default/image-tfmk6"}},"spec":{"accessModes":["ReadWriteOnce"],"resources":{"requests":{"storage":"200Gi"}},"volumeMode":"Block","storageClassName":"longhorn-image-tfmk6-onereplica"}},{"metadata":{"name":"${storageClaimName}"},"spec":{"accessModes":["ReadWriteOnce"],"resources":{"requests":{"storage":"50Gi"}},"volumeMode":"Block","storageClassName":"longhorn"}}]'
     network.harvesterhci.io/ips: "[]"
   labels:
     harvesterhci.io/creator: harvester