Add the option to define custom cipher suites for backend serverTransport

[AliMickey]

Welcome!

• Yes, I've searched similar issues on GitHub and didn't find any.
• Yes, I've searched similar issues on the Traefik community forum and didn't find any.

What did you expect to see?

Add the option to define custom cipher suites for backend serverTransport.

Similar to:

tls:
  options:
    default:
      cipherSuites:
        - TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

Allow configuring custom cipher suites onto the backend serverTransport configuration. Example:

http:
  serversTransports:
    mytransport:
      cipherSuites:
        - TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

This allows for greater compatibility with legacy systems that do not support the default ciphers that Traefik enables.

[NEwa-05]

Hi,
I'm interested in bringing this along to Traefik.
If you would like to assign me to it, please do.