Marketplace: Install libvips for testing Product::Photos

- #1430
- #1428

- Pulled from https://github.com/libvips/ruby-vips/blob/master/.github/workflows/test.yml

I'm not particularly pleased with this, but I didn't find a github
action; and I'm not entirely sure why the test passes locally but not on
CI.

spec/furniture/marketplace/cart_product_component_spec.rb

@@ -17,6 +17,7 @@
   it { is_expected.to have_content(helpers.humanized_money_with_symbol(product.price)) }
   it { is_expected.to have_link(I18n.t("marketplace.cart_product_component.add")) }
   it { is_expected.to have_link(I18n.t("marketplace.cart_product_component.remove")) }
+  it { is_expected.to have_selector("img[src$='#{product.photo.filename}']") }
 
   context "when the product is not yet in the cart" do
     let(:cart_product) { build(:marketplace_cart_product, cart: cart, product: product, quantity: 0) }