addButtonToGenesisArchive.php

<?php
/**
 * Add Read More button below post excerpts/content on archives.
 */
function jma_child_read_more()
{
    // only if this is not a singular page.
    if (!is_singular()) {
        printf('<a href="%s" class="more-link button">%s</a>', get_permalink(), esc_html__('Continue Reading'));
    }
}
add_action('genesis_entry_footer', 'jma_child_read_more');