Add integration test for ipv6.

[jcamiel]

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[jcamiel]

Closing thiS PR (can't test on GitHub runners).

curl on macOS is available under:

• /usr/bin/curl 8.1.2
• /usr/local/opt/curl/bin/curl 8.3.0

Both binary have IPv6 feature enable but only curl 8.3.0 is able to GET https://google.com with --ipv6 on GitHub macOS runners.

$ /usr/local/opt/curl/bin/curl --version
curl 8.3.0 (x86_64-apple-darwin21.6.0) libcurl/8.3.0 (SecureTransport) OpenSSL/3.1.2 zlib/1.2.11 brotli/1.1.0 zstd/1.5.5 libidn2/2.3.4 libssh2/1.11.0 nghttp2/1.56.0 librtmp/2.3 OpenLDAP/2.6.6
Release-Date: 2023-09-13
Protocols: dict file ftp ftps gopher gophers http https imap imaps ldap ldaps mqtt pop3 pop3s rtmp rtsp scp sftp smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS brotli GSS-API HSTS HTTP2 HTTPS-proxy IDN IPv6 Kerberos Largefile libz MultiSSL NTLM NTLM_WB SPNEGO SSL threadsafe TLS-SRP UnixSockets zstd
$ /usr/bin/curl --version
curl 8.1.2 (x86_64-apple-darwin21.0) libcurl/8.1.2 (SecureTransport) LibreSSL/3.3.6 zlib/1.2.11 nghttp2/1.45.1
Release-Date: 2023-05-30
Protocols: dict file ftp ftps gopher gophers http https imap imaps ldap ldaps mqtt pop3 pop3s rtsp smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS GSS-API HSTS HTTP2 HTTPS-proxy IPv6 Kerberos Largefile libz MultiSSL NTLM NTLM_WB SPNEGO SSL threadsafe UnixSockets

And test with --ipv6 against google.com:

$/usr/local/opt/curl/bin/curl --ipv6 --verbose https://google.com/
...
Connected to google.com (::ffff:142.250.115.101) port 443
...

$/usr/bin/curl --ipv6 --verbose https://google.com/
curl: (7) Couldn't connect to server

As Hurl is linked to libcurl from /usr/bin, we are not able to test --ipv6 option.

See actions/runner-images#668