fix: make cloud_services optional (#442)

Co-authored-by: Steve Peggs <peggs@uk.ibm.com>

README.md

@@ -111,7 +111,7 @@ No modules.
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
 | <a name="input_cloud_service_by_crn"></a> [cloud\_service\_by\_crn](#input\_cloud\_service\_by\_crn) | List of cloud service CRNs. The keys are the CRN. The values (all optional) give some level of control on the created VPEs. Each CRN will have a unique endpoint gateways created. For a list of supported services, see the docs [here](https://cloud.ibm.com/docs/vpc?topic=vpc-vpe-supported-services). | <pre>set(<br>    object({<br>      crn                          = string<br>      vpe_name                     = optional(string) # Full control on the VPE name. If not specified, the VPE name will be computed based on prefix, vpc name and service name.<br>      service_name                 = optional(string) # Name of the service used to compute the name of the VPE. If not specified, the service name will be obtained from the crn.<br>      allow_dns_resolution_binding = optional(bool, true)<br>    })<br>  )</pre> | `[]` | no |
-| <a name="input_cloud_services"></a> [cloud\_services](#input\_cloud\_services) | List of cloud services to create an endpoint gateway. The keys are the service names, the values (all optional) give some level of control on the created VPEs. | <pre>set(object({<br>    service_name                 = string<br>    vpe_name                     = optional(string), # Full control on the VPE name. If not specified, the VPE name will be computed based on prefix, vpc name and service name.<br>    allow_dns_resolution_binding = optional(bool, false)<br>  }))</pre> | n/a | yes |
+| <a name="input_cloud_services"></a> [cloud\_services](#input\_cloud\_services) | List of cloud services to create an endpoint gateway. The keys are the service names, the values (all optional) give some level of control on the created VPEs. | <pre>set(object({<br>    service_name                 = string<br>    vpe_name                     = optional(string), # Full control on the VPE name. If not specified, the VPE name will be computed based on prefix, vpc name and service name.<br>    allow_dns_resolution_binding = optional(bool, false)<br>  }))</pre> | `[]` | no |
 | <a name="input_prefix"></a> [prefix](#input\_prefix) | The prefix that you would like to append to your resources | `string` | `"vpe"` | no |
 | <a name="input_region"></a> [region](#input\_region) | The region where VPC and services are deployed | `string` | `"us-south"` | no |
 | <a name="input_resource_group_id"></a> [resource\_group\_id](#input\_resource\_group\_id) | ID of the resource group where endpoint gateways will be provisioned | `string` | `null` | no |

variables.tf

@@ -65,6 +65,7 @@ variable "cloud_services" {
     vpe_name                     = optional(string), # Full control on the VPE name. If not specified, the VPE name will be computed based on prefix, vpc name and service name.
     allow_dns_resolution_binding = optional(bool, false)
   }))
+  default = []
   validation {
     error_message = "Currently the service you're trying to add is not supported. Any other VPE services must be added using `cloud_service_by_crn`."
     condition = length(var.cloud_services) == 0 ? true : length([