<templates>

    <t t-extend="ListView.buttons">

        <t t-jquery="button.o_list_button_add" t-operation="after" >

            <button type="button" t-if='widget.modelName == "m.dha.sig"'

                    class="btn btn-primary btn-sm o_list_button_upload">Upload

            </button>

        </t>

    </t>

</templates>

​

__manifest__.py

'qweb':[

        'static/src/xml/button.xml',

],