ENV required:false still forcing user to set value in setup console

I have an open source project using Cloud Run + app.json to specify env vars.

Even though required=false in app.json, in the console I get the error message `Sorry, your reply was invalid: Value is required` if I try to skip setting it (via enter). It looks like required=false isn't being respected?

https://github.com/scosman/zipstreamer/tree/docker-docs