aws eks update-kubeconfig writes an insecure file

[Sarah-E-Greene]

Confirm by changing [ ] to [x] below to ensure that it's a bug:

• I've gone though the User Guide and the API reference
• I've searched for previous similar issues and didn't find any solution

Describe the bug
aws eks update-kubeconfig writes a world readable, group readable file, which the latest version of helm warns over:

WARNING: Kubernetes configuration file is group-readable. This is insecure. Location: config/kube/main-cluster
WARNING: Kubernetes configuration file is world-readable. This is insecure. Location: config/kube/main-cluster

-rw-r--r-- 1 sarah staff 2.1K 10 Aug 15:05 config/kube/main-cluster

SDK version number
aws-cli/1.18.154 Python/3.5.3 Linux/4.19.76-linuxkit botocore/1.18.13

Platform/OS/Hardware/Device
Debian Linux (inside docker)

To Reproduce (observed behavior)

1. Run aws eks update-kubeconfig
2. Run a helm operation that uses the generated kubeconfig
3. Observe warinng

Expected behavior
A file generated that doesn't create a warning in helm.

[kdaily]

Hi @SarahRiley, thanks for reporting!

This is a duplicate of #5598, but that's a PR to fix. I'll leave this issue open for more visibility. I've made the owner of the EKS customization aware of the issue.

[Sarah-E-Greene]

Thanks, I searched the issues, but not the pull requests. Excellent.

[kdaily]

This has been fixed @SarahRiley! Thanks again.

[github-actions]

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