relay: attempt to move back to `Instant` from `SystemTime` about firezone HOT 3 CLOSED

I just tried this and the problem is our authentication scheme. The TURN credentials which we generate have an embedded UNIX timestamp that indicates for how long they are valid. I cannot compare that to an Instant because Instants can only be compared against each other.

It might be possible to only use SystemTime for the auth scheme and Instants everywhere else?

cc @ReactorScram

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I think I managed to do something neat in the above linked PR :)

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@thomaseizinger Yeah that's what I was thinking. SystemTime is needed over the network but that should only be 1 or 2 places in the auth code, everything else should be Instant

I suppose if there's auth code embedded in something else you can pass both 🤔 not familiar enough with the code to know

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