Expose AWS credentials from stack config to environment so kubectl can use them

[omercnet]

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Issue details

When trying to setup an EKS cluster, one cannot only rely on configuring the aws credentials in the stack config (https://www.pulumi.com/registry/packages/aws/installation-configuration/#configuration-options) but must export them to environment variables so kubectl will pick them up.

If we would have pulumi-eks (or pulumi-aws?) expose the creds from the stack config to the environment variables for supporting tools to use then you could benefit from a single source of credentials (the stack config), which is also encrypted.

Affected area/feature

Use of AWS credentials by kubectl