This script automates the acquisition of CA thumbprint.
For example, it can be used to configure EKS nodes that support IAM Role for each pod.
This command automates the following operations: https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_providers_create_oidc_verify-thumbprint.html
usage: ca_thumbprint.sh <OIDC IdP's URL>
OIDC IdP's URL is like this: oidc.eks.ap-northeast-1.amazonaws.com/id/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
MIT