Limit enterprise image sizes on DFC API

Uploaded images can be several MB in size. While offering the big size
would enable other apps to resize it and store the image size they need,
we have only one app using it in practice and it's using the image
directly. It's much simpler and if a default size will work for others
in the future then why not just serve that.

We can revise this in the future. There is a DFC discussion about
publishing several sizes which I started:
https://github.com/datafoodconsortium/ontology/discussions/77#discussioncomment-8228094

engines/dfc_provider/app/services/enterprise_builder.rb

@@ -29,8 +29,8 @@ class EnterpriseBuilder < DfcBuilder
       # But that would require a new endpoint for a single string.
       add_ofn_property(e, "ofn:contact_name", enterprise.contact_name)
 
-      add_ofn_property(e, "ofn:logo_url", enterprise.logo.url)
-      add_ofn_property(e, "ofn:promo_image_url", enterprise.promo_image.url)
+      add_ofn_property(e, "ofn:logo_url", enterprise.logo_url(:small))
+      add_ofn_property(e, "ofn:promo_image_url", enterprise.promo_image_url(:large))
     end
   end
 

swagger/dfc.yaml

@@ -377,8 +377,8 @@ paths:
                       dfc-b:supplies: http://test.host/api/dfc/enterprises/10000/supplied_products/10001
                       ofn:long_description: "<p>Hello, world!</p><p>This is a paragraph.</p>"
                       ofn:contact_name: Fred Farmer
-                      ofn:logo_url: http://www.example.com/rails/active_storage/url/logo.png
-                      ofn:promo_image_url: http://www.example.com/rails/active_storage/url/promo.png
+                      ofn:logo_url: http://test.host/rails/active_storage/url/logo.png
+                      ofn:promo_image_url: http://test.host/rails/active_storage/url/promo.png
                       dfc-b:affiliates: http://test.host/api/dfc/enterprise_groups/60000
                     - "@id": http://test.host/api/dfc/addresses/40000
                       "@type": dfc-b:Address