Add ability to authenticate against AWS via STS

[razielgn]

Hello, this patch makes it possible to use the preferred way to authenticate pods with AWS STS (see here).
tl;dr without setting a keypair, but instead loading tokens from a mounted file handled by an admission controller.

I've tested it on our EKS deployment before submitting this PR.

[No9]

Thanks very much for this contribution.
Happy to take the code but would you mind putting some info on the configuration into the chart readme below the eksctl section.
https://github.com/IBM/core-dump-handler/blob/main/charts/core-dump-handler/README.md#eks-setup-for-gitops-pipelines-eksctl-or-similar
Also should there be an example values.yaml for it as well?
Something like https://github.com/IBM/core-dump-handler/blob/main/charts/core-dump-handler/values.aws.yaml
and call it values.aws.sts.yaml

[razielgn]

Sure, I've added a commit with more documentation and examples.

[No9]

Great thanks for the update - I'll bundle and push a release towards the end of this week.

[razielgn]

Awesome, thank you!

[No9]

merged and released in 8.4.0
Thanks again for this @razielgn