add placeholder message in version patch yaml

Author: Sanae6

.kube/version.yaml

@@ -1,3 +1,3 @@
 - op: replace
   path: /spec/template/spec/containers/0/image
-  value: kokuzo.tailc38f.ts.net/eepy-site:1368df7179b89bbd3cdd78331fca22320cc70f77
+  value: kokuzo.tailc38f.ts.net/eepy-site:this-placeholder-will-be-replace-by-actions