TEESimulator canary 73

Keep a key the caller never asked to attest (#287)

Built from 159a65c by run 39292706757.

A canary — the current state of dev, tested by CI and nothing else, published as a
prerelease so it can be downloaded (and flashed from the WebUI) without a GitHub account.

Build	Use it when
…-Debug.zip	Chasing a bug — far more logging.
…-Release.zip	You just want the newest code.

Only the five most recent canaries are kept.