[Backport 8.16] Switch to trustme for test certificates (elastic#2687)

Co-authored-by: Quentin Pradet <[email protected]>

Author: github-actions[bot]

.buildkite/certs/README.md

@@ -0,0 +1,26 @@
+# CI certificates
+
+This directory contains certificates that can be used to test against Elasticsearch in CI
+
+## Generating new certificates using the Certificate Authority cert and key
+
+Before adding support for Python 3.13, we generated certificates with
+[`elasticsearch-certutil`](https://www.elastic.co/guide/en/elasticsearch/reference/current/certutil.html).
+However, those certificates are not compliant with RFC 5280, and Python now
+enforces compliance by enabling the VERIFY_X509_STRICT flag by default.
+
+If you need to generate new certificates, you can do so with
+[trustme](https://trustme.readthedocs.io/en/latest/) as follows:
+
+```
+```bash
+pip install trustme
+python -m trustme --identities instance
+# Use the filenames expected by our tests
+mv client.pem ca.crt
+mv server.pem testnode.crt
+mv server.key testnode.key
+```
+
+For more control over the generated certificates, trustme also offers a Python
+API, but we have not needed it so far.

.buildkite/certs/ca.crt

@@ -1,20 +1,12 @@
 -----BEGIN CERTIFICATE-----
-MIIDSTCCAjGgAwIBAgIUHTeTPPuZIX3wdyudMsllXa9yZ1kwDQYJKoZIhvcNAQEL
-BQAwNDEyMDAGA1UEAxMpRWxhc3RpYyBDZXJ0aWZpY2F0ZSBUb29sIEF1dG9nZW5l
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-gAayb1krMRW/3E6hRVZAig3I2H8mezL5tF8iS5aJW1WLpw4oYnbH0DdS+gpCK1lT
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+MIIByTCCAW+gAwIBAgIUIYClYWXiTsB8aMrEEMrzdrk5rOswCgYIKoZIzj0EAwIw
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+BAMCA0gAMEUCIQDGyO21zIAwmARtoc2atVmmqZdPVkegHkCKCFY4P+KeEAIgKMCz
+aU8LPCVyA+ZF9K+tcqkNK5h/5s7wlQ5DSeKSuE8=
 -----END CERTIFICATE-----

.buildkite/certs/ca.pem

@@ -1,20 +1,14 @@
 -----BEGIN CERTIFICATE-----
-MIIDODCCAiCgAwIBAgIVAKLWEcNzTd4B0NqnrJL0xAKaS8DWMA0GCSqGSIb3DQEB
-CwUAMDQxMjAwBgNVBAMTKUVsYXN0aWMgQ2VydGlmaWNhdGUgVG9vbCBBdXRvZ2Vu
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+OTFYhR9Mw/e+WdJVZO78XZYKy5uA28JwsZuu7E0kZA==
 -----END CERTIFICATE-----

.buildkite/certs/testnode.crt

@@ -1,27 +1,5 @@
------BEGIN RSA PRIVATE KEY-----
-MIIEowIBAAKCAQEAvHi1y92V+b/CZR3H4PvegaatuBHoqlfu0Tzym3B/NDg45BE6
-mFKWpvk3DpdoLdt6f66Yj0kqTl/KRXZmO/ME5saNhgkGf3W9odIGTjmKW/B0JLvo
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-c1JdRb5+eTgPwLcDsmMWIW357PDW7RDEI07G1ZB4SqxGTKkU7JOW
------END RSA PRIVATE KEY-----
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIN+K8+F47YchiH+7gA8KBG8u35PWcOJN+Fszv8TPEEpdoAoGCCqGSM49
+AwEHoUQDQgAEqelGnUWdGT9xdinhJCFDn9AfBjk1+eQfdUTvzy1EG9usGXFphxjz
+idBwMvRdhGPqydcw1J3weZrKMHov4rqGjA==
+-----END EC PRIVATE KEY-----