Add the retrieval of "dkim_selector" for "mailgun_domain"

[Szasza]

Terraform Version

v1.4.4

Affected Resource(s)

• mailgun_domain

Expected Behavior

No change should be shown in the last terraform plan after importing a Mailgun domain which matches the Terraform configuration.

Actual Behavior

Terraform wants to recreate the mailgun_domain resource.

Steps to Reproduce

1. Set up a domain in Mailgun with the DKIM selector being MX. No need to verify the domain.
2. Write the corresponding configuration in Terraform with dkim_selector = "mx".
3. Import the Mailgun domain.
4. Run terraform plan.

Note

It seems like that resource_mailgun_domain.go's resourceMailgunDomainRetrieve function doesn't support the retrieval of the dkim_selector property.