feat: Add Point in time recovery flag for mysql DB (#607)

Author: pawanphalak

modules/mysql/README.md

@@ -11,7 +11,7 @@ Note: CloudSQL provides [disk autoresize](https://cloud.google.com/sql/docs/mysq
 | additional\_databases | A list of databases to be created in your cluster | <pre>list(object({<br>    name      = string<br>    charset   = string<br>    collation = string<br>  }))</pre> | `[]` | no |
 | additional\_users | A list of users to be created in your cluster. A random password would be set for the user if the `random_password` variable is set. | <pre>list(object({<br>    name            = string<br>    password        = string<br>    random_password = bool<br>    type            = string<br>    host            = string<br>  }))</pre> | `[]` | no |
 | availability\_type | The availability type for the master instance. Can be either `REGIONAL` or `null`. | `string` | `"REGIONAL"` | no |
-| backup\_configuration | The backup\_configuration settings subblock for the database setings | <pre>object({<br>    binary_log_enabled             = optional(bool, false)<br>    enabled                        = optional(bool, false)<br>    start_time                     = optional(string)<br>    location                       = optional(string)<br>    transaction_log_retention_days = optional(string)<br>    retained_backups               = optional(number)<br>    retention_unit                 = optional(string)<br>  })</pre> | `{}` | no |
+| backup\_configuration | The backup\_configuration settings subblock for the database setings | <pre>object({<br>    binary_log_enabled             = optional(bool, false)<br>    enabled                        = optional(bool, false)<br>    start_time                     = optional(string)<br>    location                       = optional(string)<br>    point_in_time_recovery_enabled = optional(bool, false)<br>    transaction_log_retention_days = optional(string)<br>    retained_backups               = optional(number)<br>    retention_unit                 = optional(string)<br>  })</pre> | `{}` | no |
 | connector\_enforcement | Enforce that clients use the connector library | `bool` | `false` | no |
 | create\_timeout | The optional timout that is applied to limit long database creates. | `string` | `"30m"` | no |
 | data\_cache\_enabled | Whether data cache is enabled for the instance. Defaults to false. Feature is only available for ENTERPRISE\_PLUS tier and supported database\_versions | `bool` | `false` | no |

modules/mysql/main.tf

@@ -76,6 +76,7 @@ resource "google_sql_database_instance" "default" {
         enabled                        = local.backups_enabled && var.master_instance_name == null ? true : false
         start_time                     = lookup(backup_configuration.value, "start_time", null)
         location                       = lookup(backup_configuration.value, "location", null)
+        point_in_time_recovery_enabled = lookup(backup_configuration.value, "point_in_time_recovery_enabled", false)
         transaction_log_retention_days = lookup(backup_configuration.value, "transaction_log_retention_days", null)
 
         dynamic "backup_retention_settings" {

modules/mysql/variables.tf

@@ -205,6 +205,7 @@ variable "backup_configuration" {
     enabled                        = optional(bool, false)
     start_time                     = optional(string)
     location                       = optional(string)
+    point_in_time_recovery_enabled = optional(bool, false)
     transaction_log_retention_days = optional(string)
     retained_backups               = optional(number)
     retention_unit                 = optional(string)