what

• Added optional variables key_usage and customer_master_key_spec
• Updated GitHub configs

why

• To be able to use the created KMS key with DNSSEC in Route53. The defaults remain unchanged.

references

• https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/kms_key#key_usage
• https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/kms_key#customer_master_key_spec