Always Enable Shared Configuration File Support

[bflad]

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Description

A confusing aspect of working with the Terraform S3 Backend and Terraform AWS Provider is that the underlying AWS Go SDK v1 does not automatically enable the shared configuration file (e.g. ~/.aws/config) by default like the AWS CLI and other SDKs. Enabling it requires a lesser documented environment variable: AWS_SDK_LOAD_CONFIG=1 as a workaround. While we are introducing potentially breaking changes, we will enable this support by default to reduce confusion.

Potential Library Implementation

In all relevant places:

(*session.Options).SharedConfigState = session.SharedConfigEnable

Potential Terraform Backend/Provider Configuration

No changes required. :)

References

• Make S3 backend work with credential_process w/out ENV variable terraform#22161
• Use of AWS non default credentials profile - Same issue as closed #18402 terraform#20599
• Automatically Enable AWS Go SDK Session Option SharedConfigState (AWS_SDK_LOAD_CONFIG environment variable) terraform-provider-aws#9236
• RFC Supporting credential_process for assuming roles using external credential providers terraform-provider-aws#6913