Terraform 0.12+ does not support "."'s in hash keys

variables.tf

locals {
    project = "project-name"
    env = {
        # default.name = "default-workspace-name" # <= tf0.11 notation
        default_name = "default-workspace-name"   # <= tf0.12 notation
        # other.name = "other-workspace-name"
        other_name = "other-workspace-name"
    }
    name = "${lookup(local.env, "${terraform.workspace}_name")}"
}

output name { value = "${local.name}"}

# terraform workspace new other
# terraform apply -auto-approve
# terraform workspace select default
# terraform apply -auto-approve