Pass the trusted CA from the OIDC config to the HTTP GET call just like POST

[asa-yeamans]

The GET call does not provide the trusted CA cert in opt to the HTTP GET call. Setting ca_cert to the provided value in the OIDC config

[istio-testing]

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[dio]

Could you fix DCO? I think this is a legit change. Thanks!

[asa-yeamans]

Added DCO bits

[jbraswell]

Any updates here? We'd love to have this fix.

[asa-yeamans]

I am unable to build it locally due to issues creating a build environment, so I haven't been able to verify the changes build and subsequently that they perform as expected. The changes themselves are minimal so I presume they work, but assistance in verifying that would be helpful.

[nacx]

This should have been addressed in v1.0.0 already, as part of the Go rewrite. Could you give it a try?