keys: spinning on generate keys when saving public key fails

[omsmith]

node-auth/packages/node_modules/brightspace-auth-keys/src/key-generator.js

Lines 25 to 28 in 0226d21

	.catch(() => {
	return new Promise(resolve => setTimeout(resolve, 100).unref())
	.then(this._generateNewKeys);
	});

If saving a public key fails, we wait a (short) time, generate a new key, and try again. If saving a public key will consistently fail (due to some sort of misconfiguration) this will spin CPU generating keys and trying to save them.

Would be good to either

• Don't generate a new key, just re-attempt to save the already generated one
• Back-off attempts to save the public key. Something something circuit breaker