Fix missing resource_type for clearing app buildpack cache

Author: Samze

app/jobs/v3/buildpack_cache_delete.rb

@@ -2,7 +2,7 @@ module VCAP::CloudController
   module Jobs
     module V3
       class BuildpackCacheDelete < VCAP::CloudController::Jobs::CCJob
-        attr_accessor :resource_type, :resource_guid
+        attr_accessor :resource_guid
 
         def initialize(app_guid)
           @resource_guid = app_guid
@@ -24,6 +24,10 @@ def max_attempts
           3
         end
 
+        def resource_type
+          'app'
+        end
+
         def display_name
           "#{resource_type}.clear_buildpack_cache"
         end

spec/unit/jobs/v3/buildpack_cache_delete_spec.rb

@@ -50,6 +50,12 @@ module Jobs::V3
           expect(job.job_name_in_configuration).to equal(:buildpack_cache_delete)
         end
       end
+
+      describe '#display_name' do
+        it 'returns the correct display name' do
+          expect(job.display_name).to eq('app.clear_buildpack_cache')
+        end
+      end
     end
   end
 end