Add client TLS flags for AWS provider

[cavdhut]

We utilize the AWS provider with external DNS running behind a forward proxy, which requires presenting client TLS certificates during requests. According to the documentation at https://github.com/kubernetes-sigs/external-dns/blob/master/docs/flags.md, it appears that specifying TLS client certificates and keys via --tls-client-cert and --tls-client-cert-key input arguments is supported. However, upon further investigation of the code, it seems that the AWS provider does not currently support this.

We would like to request the addition of this support for the AWS provider. If this is acceptable, I can look into creating a pull request (PR) to implement this feature.

[ivankatliarchuk]

Hi @cavdhut

Sure go ahead.

/help

[k8s-ci-robot]

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In response to this:

Hi @cavdhut

Sure go ahead.

/help

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[ivankatliarchuk]

/help
/area provider/aws

[hjoshi123]

@cavdhut are you working on this? If not I can take it up

[cavdhut]

@hjoshi123 Please take it. I did not get chance to look into this.

[hjoshi123]

/assign