Display product gallery and variation thumbnails in archives

add_action( 'woocommerce_before_shop_loop_item_title', function() {

	global $product;

	// Begin Accumulator
	$attachment_ids = [];

	// Get Gallery Images
	$attachment_ids = $product->get_gallery_image_ids();

	// Get Variation Images
	if( $product->is_type( 'variable' ) ) {
		$variations = $product->get_available_variations( 'objects' );
		foreach( $variations as $variation ) {
			$image_id = $variation->get_image_id( 'edit' );
			if( $image_id ) {
				$attachment_ids[] = $image_id;
			}
		}
	}

	// Output Five
	echo '<div class="swatches">';
	for( $i = 0; $i < 5; $i ++ ) {
		if( empty( $attachment_ids[$i] ) ) {
			break;
		}
		echo wp_get_attachment_image(
			$attachment_ids[$i],
			'thumbnail',
			true,
			[ 'class' => 'swatch' ]
		);
	}
	echo '</div>';

} );