Added SUNDAY as a day of the week (#13218) (#21640)

[upstream:9ef2b8aecc76972741dcea4f2c33164007f5e677]

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

Author: modular-magician

.changelog/13218.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+backup_dr: added missing SUNDAY option for `google_backup_dr_backup_plan.days_of_week`
+```

google/services/backupdr/resource_backup_dr_backup_plan.go

@@ -132,10 +132,10 @@ The end hour of the day should be greater than the start`,
 										Type:        schema.TypeList,
 										Optional:    true,
 										ForceNew:    true,
-										Description: `Specifies days of week like MONDAY or TUESDAY, on which jobs will run. This is required for 'recurrence_type', 'WEEKLY' and is not applicable otherwise. Possible values: ["DAY_OF_WEEK_UNSPECIFIED", "MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY", "FRIDAY", "SATURDAY"]`,
+										Description: `Specifies days of week like MONDAY or TUESDAY, on which jobs will run. This is required for 'recurrence_type', 'WEEKLY' and is not applicable otherwise. Possible values: ["DAY_OF_WEEK_UNSPECIFIED", "MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY", "FRIDAY", "SATURDAY", "SUNDAY"]`,
 										Elem: &schema.Schema{
 											Type:         schema.TypeString,
-											ValidateFunc: verify.ValidateEnum([]string{"DAY_OF_WEEK_UNSPECIFIED", "MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY", "FRIDAY", "SATURDAY"}),
+											ValidateFunc: verify.ValidateEnum([]string{"DAY_OF_WEEK_UNSPECIFIED", "MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY", "FRIDAY", "SATURDAY", "SUNDAY"}),
 										},
 									},
 									"hourly_frequency": {

website/docs/r/backup_dr_backup_plan.html.markdown

@@ -122,7 +122,7 @@ The following arguments are supported:
 * `days_of_week` -
   (Optional)
   Specifies days of week like MONDAY or TUESDAY, on which jobs will run. This is required for `recurrence_type`, `WEEKLY` and is not applicable otherwise.
-  Each value may be one of: `DAY_OF_WEEK_UNSPECIFIED`, `MONDAY`, `TUESDAY`, `WEDNESDAY`, `THURSDAY`, `FRIDAY`, `SATURDAY`.
+  Each value may be one of: `DAY_OF_WEEK_UNSPECIFIED`, `MONDAY`, `TUESDAY`, `WEDNESDAY`, `THURSDAY`, `FRIDAY`, `SATURDAY`, `SUNDAY`.
 
 * `days_of_month` -
   (Optional)