alloydb: make psc_instance_config O+C in google_alloydb_instance (#11444) (#19143)

[upstream:69a0316490e4e808ab8302a864decc238ba00b81]

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/11444.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+alloydb: fixed a permadiff on `psc_instance_config` in `google_alloydb_instance` resource
+```

google/services/alloydb/resource_alloydb_instance.go

@@ -217,6 +217,7 @@ the same instance.`,
 			},
 			"psc_instance_config": {
 				Type:        schema.TypeList,
+				Computed:    true,
 				Optional:    true,
 				Description: `Configuration for Private Service Connect (PSC) for the instance.`,
 				MaxItems:    1,

google/services/alloydb/resource_alloydb_instance_generated_test.go

@@ -167,6 +167,57 @@ data "google_compute_network" "default" {
 `, context)
 }
 
+func TestAccAlloydbInstance_alloydbInstancePscTestExample(t *testing.T) {
+	t.Parallel()
+
+	context := map[string]interface{}{
+		"random_suffix": acctest.RandString(t, 10),
+	}
+
+	acctest.VcrTest(t, resource.TestCase{
+		PreCheck:                 func() { acctest.AccTestPreCheck(t) },
+		ProtoV5ProviderFactories: acctest.ProtoV5ProviderFactories(t),
+		CheckDestroy:             testAccCheckAlloydbInstanceDestroyProducer(t),
+		Steps: []resource.TestStep{
+			{
+				Config: testAccAlloydbInstance_alloydbInstancePscTestExample(context),
+			},
+			{
+				ResourceName:            "google_alloydb_instance.default",
+				ImportState:             true,
+				ImportStateVerify:       true,
+				ImportStateVerifyIgnore: []string{"annotations", "cluster", "display_name", "instance_id", "labels", "reconciling", "terraform_labels", "update_time"},
+			},
+		},
+	})
+}
+
+func testAccAlloydbInstance_alloydbInstancePscTestExample(context map[string]interface{}) string {
+	return acctest.Nprintf(`
+resource "google_alloydb_instance" "default" {
+  cluster       = google_alloydb_cluster.default.name
+  instance_id   = "tf-test-alloydb-instance%{random_suffix}"
+  instance_type = "PRIMARY"
+
+  machine_config {
+    cpu_count = 2
+  }
+}
+
+resource "google_alloydb_cluster" "default" {
+  cluster_id = "tf-test-alloydb-cluster%{random_suffix}"
+  location   = "us-central1"
+
+  initial_user {
+    password = "tf-test-alloydb-cluster%{random_suffix}"
+  }
+  psc_config {
+    psc_enabled = true
+  }
+}
+`, context)
+}
+
 func testAccCheckAlloydbInstanceDestroyProducer(t *testing.T) func(s *terraform.State) error {
 	return func(s *terraform.State) error {
 		for name, rs := range s.RootModule().Resources {