[#2180] Empty skeleton for pj transfer cleanup task

Might not actually be necessary (we don't really have
a delete feature), but just in case

lib/tasks/2018_12_03_finish_piece_jointe_transfer.rake

@@ -0,0 +1,39 @@
+namespace :'2018_12_03_finish_piece_jointe_transfer' do
+  task run: :environment do
+    Class.new do
+      def run
+        check_env
+        notify_dry_run
+        notify_dry_run
+      end
+
+      def check_env
+        if !ActiveStorage::Blob.service.respond_to?(:change_content_type)
+          fail "Not running on openstack"
+        end
+      end
+
+      def notify_dry_run
+        if !force?
+          rake_puts "Dry run, run with FORCE=1 to actually perform changes"
+        end
+      end
+
+      def force?
+        if !defined? @force
+          @force = (ENV['FORCE'].presence || '0').to_i != 0
+        end
+
+        @force
+      end
+
+      def verbose?
+        if !defined? @verbose
+          @verbose = (ENV['VERBOSE'].presence || '0').to_i != 0
+        end
+
+        @verbose
+      end
+    end.new.run
+  end
+end