maintenance-tools/maintenance_user_ssh_key/views/res_users_views.xml

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

    <record id="view_users_form_ssh_key_inherit" model="ir.ui.view">
        <field name="name">res.users.form.ssh.key</field>
        <field name="model">res.users</field>
        <field name="inherit_id" ref="base.view_users_form"/>
        <field name="arch" type="xml">
            <xpath expr="//notebook" position="inside">
                <page string="SSH Keys" name="ssh_keys">
                    <field name="ssh_key_ids">
                        <list editable="top">
                            <field name="key"/>
                        </list>
                    </field>
                </page>
            </xpath>
        </field>
    </record>

</odoo>