Fix storage related roles for compute service account in cloud deploy release example (#19)

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The roles listed in the instructions of cloud deploy to cloud run
example are not working. They generate the following error:

```
400: The role name must be in the form "roles/{role}", "organizations/{organization_id}/roles/{role}", or "projects/{project_id}/roles/{role}"., badRequest
```

I checked the roles on [the Storage IAM Roles
page](https://cloud.google.com/storage/docs/access-control/iam-roles)
and corrected them.

Signed-off-by: Can Kutlu Kınay <[email protected]>

Author: cakuki

workflows/create-cloud-deploy-release/cloud-deploy-to-cloud-run.yml

@@ -45,8 +45,8 @@
 #      roles/run.developer              (To create Cloud Run services)
 #
 #    Cloud Storage
-#      storage/object.viewer            (To read Cloud Deploy artifacts)
-#      storage/object.creator           (To write Cloud Deploy artifacts)
+#      roles/storage.objectViewer       (To read Cloud Deploy artifacts)
+#      roles/storage.objectCreator      (To write Cloud Deploy artifacts)
 #
 #    Additionally, the default compute service account requires permissions to "ActAs" itself
 #    to be able to deploy to Cloud Run. You can add this permission with the following command: