odoo-survey-addons/survey_page_duplicate/views/survey_survey.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

  <record id="survey_survey_form" model="ir.ui.view">
    <field name="name">survey_page_duplicate survey.survey form</field>
    <field name="model">survey.survey</field>
    <field name="inherit_id" ref="survey.survey_form"/>
    <field name="priority">20</field>
    <field name="arch" type="xml">
      <xpath expr="//field[@name='page_ids']/tree" position="inside">
        <button type="object" name="copy" string="Duplicate" icon="fa-copy" class="oe_edit_only"/>
      </xpath>
    </field>
  </record>

</odoo>