provider: Authentication updates for Terraform AWS Provider v3.0.0

[bflad]

Community Note

• Please vote on this pull request by adding a 👍 reaction to the original pull request comment to help the community and maintainers prioritize this request
• Please do not leave "+1" or other comments that do not add relevant new information or questions, they generate extra noise for pull request followers and do not help prioritize the request

Closes #5018
Closes #6913
Closes #7333
Closes #9236
Closes #9869
Closes #9898
Closes #9962
Closes #9986
Closes #10507
Closes #11429
Closes #12236
Closes #12727
Closes #12815
Closes #13057

Release note for CHANGELOG:

NOTES

* provider: Credential ordering has changed from static, environment, shared credentials, EC2 metadata, default AWS Go SDK (shared configuration, web identity, ECS, EC2 Metadata) to static, environment, shared credentials, default AWS Go SDK (shared configuration, web identity, ECS, EC2 Metadata)
* provider: The `AWS_METADATA_TIMEOUT` environment variable no longer has any effect as we now depend on the default AWS Go SDK EC2 Metadata client timeout of one second with two retries

ENHANCEMENTS

* provider: Always enable shared configuration file support (no longer require `AWS_SDK_LOAD_CONFIG` environment variable)
* provider: Add `assume_role` configuration block `duration_seconds`, `policy_arns`, `tags`, and `transitive_tag_keys` arguments

BUG FIXES

* provider: Ensure configured STS endpoint is used during `AssumeRole` API calls
* provider: Prefer AWS shared configuration over EC2 metadata credentials by default
* provider: Prefer CodeBuild, ECS, EKS credentials over EC2 metadata credentials by default

Output from acceptance testing:

--- PASS: TestAccAWSProvider_Region_AwsCommercial (3.89s)
--- PASS: TestAccAWSProvider_Region_AwsGovCloudUs (3.90s)
--- PASS: TestAccAWSProvider_Region_AwsChina (3.99s)
--- PASS: TestAccAWSProvider_IgnoreTags_Keys_None (4.22s)
--- PASS: TestAccAWSProvider_IgnoreTags_KeyPrefixes_None (4.29s)
--- PASS: TestAccAWSProvider_IgnoreTags_KeyPrefixes_One (4.37s)
--- PASS: TestAccAWSProvider_IgnoreTags_KeyPrefixes_Multiple (4.38s)
--- PASS: TestAccAWSProvider_IgnoreTags_Keys_One (4.39s)
--- PASS: TestAccAWSProvider_IgnoreTags_EmptyConfigurationBlock (4.40s)
--- PASS: TestAccAWSProvider_IgnoreTags_Keys_Multiple (4.40s)
--- PASS: TestAccAWSProvider_Endpoints_Deprecated (4.42s)
--- PASS: TestAccAWSProvider_Endpoints (4.53s)
--- PASS: TestAccAWSProvider_AssumeRole_Empty (8.32s)

[gdavison]

LGTM 🚀

--- PASS: TestAccAWSProvider_Region_AwsCommercial (11.19s)
--- PASS: TestAccAWSProvider_Region_AwsChina (11.05s)
--- PASS: TestAccAWSProvider_Region_AwsGovCloudUs (11.54s)
--- PASS: TestAccAWSProvider_IgnoreTags_KeyPrefixes_One (11.74s)
--- PASS: TestAccAWSProvider_IgnoreTags_Keys_Multiple (11.83s)
--- PASS: TestAccAWSProvider_IgnoreTags_EmptyConfigurationBlock (11.68s)
--- PASS: TestAccAWSProvider_IgnoreTags_KeyPrefixes_None (12.01s)
--- PASS: TestAccAWSProvider_IgnoreTags_Keys_None (12.00s)
--- PASS: TestAccAWSProvider_IgnoreTags_KeyPrefixes_Multiple (12.13s)
--- PASS: TestAccAWSProvider_IgnoreTags_Keys_One (12.01s)
--- PASS: TestAccAWSProvider_Endpoints_Deprecated (12.42s)
--- PASS: TestAccAWSProvider_Endpoints (12.45s)
--- PASS: TestAccAWSProvider_AssumeRole_Empty (24.31s)

[ghost]

This has been released in version 3.0.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template for triage. Thanks!

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!