container: make additional containers use only first docker network

roles/container/tasks/database.yml

@@ -75,7 +75,8 @@
     published_ports: "{{ db_published_ports | default(omit) }}"
     restart_policy: always
     mounts: "{{ db_container_mount_definition }}"
-    networks: "{{ container_networks | default(omit) }}"
+    networks:
+      - "{{ container_networks[0] }}"
     log_driver: local
 
 - name: phpMyAdmin container for {{ docker_service_name }}
@@ -89,6 +90,7 @@
     published_ports:
       - "127.0.0.1:{{ ports[docker_service_name]['phpmyadmin'] }}:80"
     restart_policy: always
-    networks: "{{ container_networks | default(omit) }}"
+    networks:
+      - "{{ container_networks[0] }}"
     log_driver: local
   when: docker_database == 'mariadb' and ports[docker_service_name]['phpmyadmin'] is defined