feat: make email a required parameter

[kolbeinn]

Summary

This module creates an OCI user for the Lacework integration. OCI users need have an email. This PR makes the user email a required parameter instead of defaulting to 'lacework@lacework.net', which users do not have access to.

How did you test this change?

Run the default example and make sure nothing broke:

cd examples/default-iam-user
tf init
TF_VAR_tenancy_ocid=<tenancy_ocid> tf plan
TF_VAR_tenancy_ocid=<tenancy_ocid> tf validate

Issue

N/A

[dmurray-lacework]

When email is not supplied what is the error outputted by Terraform?

If the current error is not helpful perhaps adding validation to the var could allow a better output.

https://developer.hashicorp.com/terraform/language/values/variables#custom-validation-rules

[kolbeinn]

When email is not supplied what is the error outputted by Terraform?

If the current error is not helpful perhaps adding validation to the var could allow a better output.

https://developer.hashicorp.com/terraform/language/values/variables#custom-validation-rules

Good question. Let me check and add custom validation as needed.

[kolbeinn]

@dmurray-lacework The error message seems fine to me. Happy to add a custom one if anybody has a better one, though.