set mysql replicas to 1 explicitly [ci skip]

modules/kubernetes/dbaas/main.tf

@@ -101,6 +101,7 @@ resource "kubernetes_deployment" "mysql" {
     }
   }
   spec {
+    replicas = 1
     selector {
       match_labels = {
         app = "mysql"
@@ -201,7 +202,7 @@ resource "kubernetes_cron_job_v1" "mysql-backup" {
               # run kubectl port-forward to pod e.g.:
               # > kb port-forward mysql-647cfd4969-46rmw --address 0.0.0.0 3307:3306
               # run mysql import (and specify non-localhost address to avoid using unix socket):
-              # > mysql -u root -p --host 10.0.10.104 --port 3307 < /mnt/nfs/2024_01_06_13_54.sql
+              # > mysql -u root -p --host 10.0.10.10 --port 3307 < /mnt/nfs/2024_01_06_13_54.sql
               volume_mount {
                 name       = "mysql-backup"
                 mount_path = "/backup"