Attempt to make kernel builds reproducible - #88
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This is useless because we use an ephemeral key that we immediately throw away and don't distribute. On the negative side it makes the build unreproducible.
Extra hardening that the workstation has that Claude noticed the server was missing.
Because our kernels are public, using a random seed has minimal value for a dedicated attacker because they can figure out e.g. randomized struct layout by using the published headers or decompiling vmlinux. It could have some value in forcing attackers to make their exploits work with our layouts. But since it interferes with reproducibility, use a fixed seed so we still retain the advantage of a different layout than stock kernels but builds will not actually be random.
To verify our code that injects a deterministic seed works as expected and that it doesn't break reproducibility.
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Refs #3.