Client TLS certificates for AutoscalingRunnerSet

[calebho]

What would you like added?

I'd like to add support for configuring client TLS certificates in AutoscalingRunnerSet

Why is this needed?

In our environment, we use an HTTPS proxy with mTLS for client authentication, e.g.

curl --proxy https://our-proxy --proxy-key $KEY_PATH --proxy-cert $CERT_PATH ...

Currently, only basic HTTP authentication is supported

Additional context

Looking at the code

actions-runner-controller/github/actions/client.go

Line 222 in 088e2a3

transport.TLSClientConfig = &tls.Config{}

I think this boils down to threading configuration down to set tls.Config.GetClientCertificate