feat: Create SQL Server PITR sample (#794)

* Create /cloud_sql/sqlserver_instance_pitr/main.tf

Create /cloud_sql/sqlserver_instance_pitr/main.tf

Please verify resource, resource name, tier, and database_version.

* Binary log can only be enabled for MySQL instances

* root_password required for MSSQL

* Update copyright year for cloud_sql/sqlserver_instance_pitr/main.tf

---------

Co-authored-by: Katie McLaughlin <[email protected]>

Author: rebecca-pete

cloud_sql/sqlserver_instance_pitr/main.tf

@@ -0,0 +1,35 @@
+/**
+ * Copyright 2025 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.
+ */
+
+# [START cloud_sql_sqlserver_instance_pitr]
+resource "google_sql_database_instance" "default" {
+  name             = "sqlserver-instance-pitr"
+  region           = "asia-northeast1"
+  database_version = "SQLSERVER_2019_ENTERPRISE"
+  root_password    = "INSERT-PASSWORD-HERE"
+  settings {
+    tier = "db-custom-4-26624"
+    backup_configuration {
+      enabled                        = true
+      start_time                     = "20:55"
+      transaction_log_retention_days = "3"
+    }
+  }
+  # set `deletion_protection` to true, will ensure that one cannot accidentally delete this instance by
+  # use of Terraform whereas `deletion_protection_enabled` flag protects this instance at the GCP level.
+  deletion_protection = false
+}
+# [END cloud_sql_sqlserver_instance_pitr]