gh-118658: Modify cert generation script to extract cert3.pem by felixfontein · Pull Request #124599 · python/cpython

ERROR: test_certificate_chain (test.test_ssl.TestPostHandshakeAuth.test_certificate_chain)
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Traceback (most recent call last):
  File "/home/runner/work/cpython/cpython/Lib/test/test_ssl.py", line 4707, in test_certificate_chain
    expected_ee_cert = ssl.PEM_cert_to_DER_cert(f.read())
  File "/home/runner/work/cpython/cpython/Lib/ssl.py", line 1498, in PEM_cert_to_DER_cert
    raise ValueError("Invalid PEM encoding; must start with %s"
                     % PEM_HEADER)
ValueError: Invalid PEM encoding; must start with -----BEGIN CERTIFICATE-----