Show variable product options on product archives

add_action( 'init', function() {

	remove_action(
		'woocommerce_after_shop_loop_item',
		'woocommerce_template_loop_add_to_cart',
		10
	);

	add_action( 'woocommerce_after_shop_loop_item', function() {

		global $product;
		if( ! $product->is_type( 'variable' ) ) {
			woocommerce_template_loop_add_to_cart();
			return;
		}

		remove_action(
			'woocommerce_single_variation',
			'woocommerce_single_variation_add_to_cart_button',
			20
		);

		add_action( 'woocommerce_single_variation', function() {

			global $product;
			?>
			<div class="woocommerce-variation-add-to-cart variations_button">
			<button type="submit" class="single_add_to_cart_button button">
				<?php echo esc_html( $product->single_add_to_cart_text() ); ?>
			</button>
			<input type="hidden" name="add-to-cart" value="<?php echo absint( $product->get_id() ); ?>" />
			<input type="hidden" name="product_id" value="<?php echo absint( $product->get_id() ); ?>" />
			<input type="hidden" name="variation_id" class="variation_id" value="0" />
			</div>
			<?php

		}, 20 );

		woocommerce_template_single_add_to_cart();

	}, 10 );

} );