feat: Add example with stateful disks in stateful policy (terraform-google-modules#578)

* Added example for Zonal MIGs

* Update compute/zonal_instance_group_manager/main.tf

Co-authored-by: Sampath Kumar <[email protected]>

* Update compute/zonal_instance_group_manager/main.tf

Co-authored-by: Sampath Kumar <[email protected]>

* Update compute/zonal_instance_group_manager/main.tf

Co-authored-by: Sampath Kumar <[email protected]>

* changed base instance name for instances in the mig

* add example with stateful disks in stateful policy

---------

Co-authored-by: Sampath Kumar <[email protected]>

Author: askubis

compute/zonal_mig_stateful_policy_disk/main.tf

@@ -0,0 +1,55 @@
+/**
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Made to resemble:
+ * gcloud compute instance-groups managed create example-database-group \
+ *  --template example-database-template-v01 \
+ *  --base-instance-name shard \
+ *  --size 12 \
+ *  --stateful-disk device-name=data-disk,auto-delete=on-permanent-instance-deletion
+ */
+
+# [START compute_stateful_instance_group_manager_disk_policy_parent_tag]
+resource "google_compute_instance_template" "default" {
+  name         = "example-database-template-v01"
+  machine_type = "e2-medium"
+  disk {
+    device_name  = "data-disk"
+    source_image = "debian-cloud/debian-11"
+  }
+  network_interface {
+    network = "default"
+  }
+}
+
+# [START compute_stateful_instance_group_manager_disk_policy]
+resource "google_compute_instance_group_manager" "default" {
+  name               = "example-database-group"
+  base_instance_name = "shard"
+  target_size        = 12
+  zone               = "us-central1-f"
+  version {
+    instance_template = google_compute_instance_template.default.id
+    name              = "primary"
+  }
+  stateful_disk {
+    device_name = "data-disk"
+    delete_rule = "ON_PERMANENT_INSTANCE_DELETION"
+  }
+}
+# [END compute_stateful_instance_group_manager_disk_policy]
+# [END compute_stateful_instance_group_manager_disk_policy_parent_tag]