aws/resource_aws_iot_role_alias: Add arn to the IoT role alias resource

[jhosteny]

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Fixes #8811

Release note for CHANGELOG:

resource/aws_iot_role_alias: Add `arn` attribute (#8811)

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccAWSIotRoleAlias_basic'
make testacc TESTARGS='-run=TestAccAWSIotRoleAlias_basic'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./... -v -parallel 20 -run=TestAccAWSIotRoleAlias_basic -timeout 120m
?   	github.com/terraform-providers/terraform-provider-aws	[no test files]
=== RUN   TestAccAWSIotRoleAlias_basic
=== PAUSE TestAccAWSIotRoleAlias_basic
=== CONT  TestAccAWSIotRoleAlias_basic
--- PASS: TestAccAWSIotRoleAlias_basic (89.35s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	89.370s

[bflad]

Hi @jhosteny 👋 Thanks for contributing this! If you haven't seen the Contributing Guide section on adding an enhancement to a resource, we would recommend checking it out.

In this case, we will need two additional items before this can be merged:

• Adding documentation for the new attribute in website/docs/r/iot_role_alias.html.markdown in the Attributes section, e.g.

* `arn` - Amazon Resource Name (ARN) of the IOT Role Alias

• Adding covering acceptance testing for the new attribute in aws/resource_aws_iot_role_alias_test.go in TestAccAWSIotRoleAlias_basic under the first TestStep Check, e.g. something like the below (I couldn't find the exact ARN format in the Amazon Resource Names documentation)

testAccCheckResourceAttrRegionalARN("aws_iot_role_alias.ra", "arn", "iot", fmt.Sprintf("alias/%s", alias)),

Please reach out if you have any questions!

[jhosteny]

@bflad thanks, I've added the missing docs and test

[bflad]

Thanks for the update, @jhosteny, looks good. 🚀

Output from acceptance testing:

--- PASS: TestAccAWSIotRoleAlias_basic (44.95s)

[bflad]

This has been released in version 2.13.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

[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!