Add Ruby file that leaks memory and generates three heap dumps

Along with the dumps themselves, in a compressed bzip2 archive, as
compression ratio was 30 to 1.

test/leak.rb

@@ -0,0 +1,28 @@
+require 'objspace'
+
+class Leaky
+  def self.leak
+    @leak ||= []
+  end
+
+  def doit
+    noleak = []
+
+    50.times do
+      self.class.leak << 'leaked memory'
+      noleak << 'not leaked'
+    end
+  end
+end
+
+def dump_heap(filename)
+  GC.start
+  File.open(filename, 'w') { |file| ObjectSpace.dump_all(output: file) }
+end
+
+Leaky.new.doit
+dump_heap('heap1.jsonl')
+Leaky.new.doit
+dump_heap('heap2.jsonl')
+Leaky.new.doit
+dump_heap('heap3.jsonl')