Add fields for custom ranges for interconnect attachment (#14106) (#23043)

[upstream:844aac8472ba65afa501f62815a12e52882f9ef5]

Signed-off-by: Modular Magician <magic-modules@google.com>

Author: modular-magician

.changelog/14106.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+compute: added `candidate_cloud_router_ip_address`, `candidate_customer_router_ip_address`, `candidate_cloud_router_ipv6_address`, and `candidate_customer_router_ipv6_address` fields to `google_compute_interconnect_attachment` resource (beta)
+```

website/docs/r/compute_interconnect_attachment.html.markdown

@@ -105,6 +105,45 @@ resource "google_compute_network" "network" {
   auto_create_subnetworks = false
 }
 ```
+<div class = "oics-button" style="float: right; margin: 0 0 -15px">
+  <a href="https://console.cloud.google.com/cloudshell/open?cloudshell_git_repo=https%3A%2F%2Fgithub.com%2Fterraform-google-modules%2Fdocs-examples.git&cloudshell_image=gcr.io%2Fcloudshell-images%2Fcloudshell%3Alatest&cloudshell_print=.%2Fmotd&cloudshell_tutorial=.%2Ftutorial.md&cloudshell_working_dir=compute_interconnect_attachment_custom_ranges&open_in_editor=main.tf" target="_blank">
+    <img alt="Open in Cloud Shell" src="//gstatic.com/cloudssh/images/open-btn.svg" style="max-height: 44px; margin: 32px auto; max-width: 100%;">
+  </a>
+</div>
+## Example Usage - Compute Interconnect Attachment Custom Ranges
+
+
+```hcl
+resource "google_compute_interconnect_attachment" "custom-ranges-interconnect-attachment" {
+  name                                   = "test-custom-ranges-interconnect-attachment"
+  edge_availability_domain               = "AVAILABILITY_DOMAIN_1"
+  type                                   = "PARTNER"
+  router                                 = google_compute_router.foobar.id
+  mtu                                    = 1500
+  stack_type                             = "IPV4_IPV6"
+  labels                                 = { mykey = "myvalue" }
+  candidate_cloud_router_ip_address      = "192.169.0.1/29"
+  candidate_customer_router_ip_address   = "192.169.0.2/29"
+  candidate_cloud_router_ipv6_address    = "748d:2f23:6651:9455:828b:ca81:6fe0:fed1/125"
+  candidate_customer_router_ipv6_address = "748d:2f23:6651:9455:828b:ca81:6fe0:fed2/125"
+  provider                               = google-beta
+}
+
+resource "google_compute_router" "foobar" {
+  name     = "test-router"
+  network  = google_compute_network.foobar.name
+  bgp {
+    asn = 16550
+  }
+  provider = google-beta
+}
+
+resource "google_compute_network" "foobar" {
+  name                    = "test-network"
+  auto_create_subnetworks = false
+  provider                = google-beta
+}
+```
 
 ## Argument Reference
 
@@ -249,6 +288,26 @@ The following arguments are supported:
   **Note**: This field is non-authoritative, and will only manage the labels present in your configuration.
   Please refer to the field `effective_labels` for all of the labels present on the resource.
 
+* `candidate_cloud_router_ip_address` -
+  (Optional, [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html))
+  Single IPv4 address + prefix length to be configured on the cloud router interface for this
+  interconnect attachment. Example: 203.0.113.1/29
+
+* `candidate_customer_router_ip_address` -
+  (Optional, [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html))
+  Single IPv4 address + prefix length to be configured on the customer router interface for this
+  interconnect attachment. Example: 203.0.113.2/29
+
+* `candidate_cloud_router_ipv6_address` -
+  (Optional, [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html))
+  Single IPv6 address + prefix length to be configured on the cloud router interface for this
+  interconnect attachment. Example: 2001:db8::1/125
+
+* `candidate_customer_router_ipv6_address` -
+  (Optional, [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html))
+  Single IPv6 address + prefix length to be configured on the customer router interface for this
+  interconnect attachment. Example: 2001:db8::2/125
+
 * `region` -
   (Optional)
   Region where the regional interconnect attachment resides.