It seems Ruby is not a supported language for Images AP <https://cloud.google.com/appengine/docs/standard/python/images/>I. You can use App Engine Flex and implement a Ruby custom runtime <https://github.com/GoogleCloudPlatform/ruby-docker> however only App Engine Standard has access to the Images service <https://cloud.google.com/appengine/docs/flexible/python/migrating#images>. This feature request has been filed and you can updates on this feature using this issue tracker <https://issuetracker.google.com/35901053>. Please note that feature requests are not guaranteed and there is no ETA on them.
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