[docs] Update TLS-based Authentication Example #5534
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Fixes #5521
The fix is adding
-sha256
to use SHA 256 digests for certificates rather than SHA1. Since go 1.18, SHA1 is rejected by go TLS. (golang/go#41682)This PR also updates the tutorial to use ECDSA keys, reduces the lifetimes of the certs used and updates the sample logs to match what OPA and curl show today.