Adds release tags report.

closes #4825

app/reports/latest_release_tags.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+# Reports most recent release tags.
+
+# Invoke via:
+# bin/rails r -e production "LatestReleaseTags.report"
+class LatestReleaseTags
+  SQL = <<~SQL.squish.freeze
+    select tags.*, case when dros.id is not null then 'dro' else 'collection' end as object_type from
+    (
+    select distinct on (druid, released_to, what)
+    druid, released_to, what, release
+    from release_tags
+    order by druid, released_to, what, created_at desc
+    ) as tags
+    left outer join dros on tags.druid=dros.external_identifier;
+  SQL
+
+  def self.report
+    puts "druid,released_to,what,release,object_type\n"
+
+    sql_result_rows = ActiveRecord::Base.connection.execute(SQL)
+    sql_result_rows.each do |row|
+      puts "#{row['druid']},#{row['released_to']},#{row['what']},#{row['release']},#{row['object_type']}"
+    end
+  end
+end