support ECH

[hmoffatt]

It would be great if the curl container could support testing ECH; currently, it says it wasn't built for it.

$ podman run -it --rm quay.io/curl/curl:latest --ech true
curl: option --ech: the installed libcurl version does not support this
curl: try 'curl --help' or 'curl --manual' for more information

$ podman run -it --rm quay.io/curl/curl:latest --version
curl 8.13.0 (x86_64-pc-linux-musl) libcurl/8.13.0 OpenSSL/3.3.3 zlib/1.3.1 brotli/1.1.0 zstd/1.5.6 libidn2/2.3.7 libpsl/0.21.5 libssh2/1.11.1 nghttp2/1.64.0
Release-Date: 2025-04-02
Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns mqtt pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp ws wss
Features: alt-svc AsynchDNS brotli GSS-API HSTS HTTP2 HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM PSL SPNEGO SSL threadsafe TLS-SRP UnixSockets zstd

Same for the dev version

$ podman run -it --rm ghcr.io/curl/curl-container/curl:master --ech true
curl: option --ech: the installed libcurl version does not support this
curl: try 'curl --help' or 'curl --manual' for more information

$ podman run -it --rm ghcr.io/curl/curl-container/curl:master --version
curl 8.14.0-DEV (x86_64-pc-linux-musl) libcurl/8.14.0-DEV OpenSSL/3.3.3 zlib/1.3.1 brotli/1.1.0 zstd/1.5.6 libidn2/2.3.7 libpsl/0.21.5 libssh2/1.11.1 nghttp2/1.64.0
Release-Date: [unreleased]
Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns mqtt pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp ws wss
Features: alt-svc AsynchDNS brotli GSS-API HSTS HTTP2 HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM PSL SPNEGO SSL threadsafe TLS-SRP UnixSockets zstd

Thanks!