Specify maximum size for Dependency Proxy upload

app/controllers/groups/dependency_proxy_for_containers_controller.rb

@@ -59,7 +59,7 @@ class Groups::DependencyProxyForContainersController < ::Groups::DependencyProxy
   def authorize_upload_blob
     set_workhorse_internal_api_content_type
 
-    render json: DependencyProxy::FileUploader.workhorse_authorize(has_length: false)
+    render json: DependencyProxy::FileUploader.workhorse_authorize(has_length: false, maximum_size: 5.gigabytes)
   end
 
   def upload_blob

spec/controllers/groups/dependency_proxy_for_containers_controller_spec.rb

@@ -397,11 +397,24 @@ RSpec.describe Groups::DependencyProxyForContainersController do
         group.add_guest(user)
       end
 
-      it 'sends Workhorse file upload instructions', :aggregate_failures do
+      it 'sends Workhorse local file instructions', :aggregate_failures do
         authorize_upload_blob
 
         expect(response.headers['Content-Type']).to eq(Gitlab::Workhorse::INTERNAL_API_CONTENT_TYPE)
         expect(json_response['TempPath']).to eq(DependencyProxy::FileUploader.workhorse_local_upload_path)
+        expect(json_response['RemoteObject']).to be_nil
+        expect(json_response['MaximumSize']).to eq(5.gigabytes)
+      end
+
+      it 'sends Workhorse remote object instructions', :aggregate_failures do
+        stub_dependency_proxy_object_storage(direct_upload: true)
+
+        authorize_upload_blob
+
+        expect(response.headers['Content-Type']).to eq(Gitlab::Workhorse::INTERNAL_API_CONTENT_TYPE)
+        expect(json_response['TempPath']).to be_nil
+        expect(json_response['RemoteObject']).not_to be_nil
+        expect(json_response['MaximumSize']).to eq(5.gigabytes)
       end
     end
   end