ITA: Ensure https_proxy is taken into consideration in the deployment

[fidencio]

Describe the bug

As the deployment has no knowledge about the https_proxy env var, the kbs container will not be able to properly startup the kbs service as it cannot contact the ITA server.

How to reproduce

Deploy ITA behind proxies using the Kata Containers CI, and you'll see that the pod_checker will fail.

CoCo version information

latest

What TEE are you seeing the problem on

Tdx

Failing command and relevant log output

No response

[Xynnn007]

Hi @fidencio , in which way you set the HTTPS_PROXY env?

cc @mythi

[mythi]

Perhaps we need to prioritize getting #361 fixed so that "downstreams" can apply kustomizations on top of what trustee repo offers more easily.