fix(compose): made port expose optional

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

roles/reverse_proxy/templates/Caddyfile.j2

@@ -4,6 +4,7 @@
 }
 
 {% for service in services %}
+{% if service.ports is defined %}
 {% if service.ports is iterable %}
 {% set http_port = service.ports | selectattr('name', 'equalto', 'http') | map(attribute='external') | list %}
 {% if http_port %}
@@ -26,6 +27,8 @@
 		resolvers 1.1.1.1
 	}
 }
+
+{% endif %}
 {% endif %}
 {% endif %}
 {% endfor %}