Make mysqlnet an internal network.

tasks/mysql-server_install_from_backup_stage_1.yml

@@ -2,6 +2,10 @@
 - name: Create mysqlnet network
   containers.podman.podman_network:
     name: mysqlnet
+    # We do not need to publish ports from this network
+    # and publishing ports on containers that are attached to mysqlnet
+    # and other networks will not work unless all networks but one are internal.
+    internal: true
   become: true
 
 - name: Create /usr/local/docker-mounted-files/docker-mysql-server-stack directory