Problem: not enough packages

Solution: keep adding them

This time it is Tembo's pgmq. Required some customization, but this is
where pgpm's strength is!

Author: yrashk

packages/pgmq.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class Pgmq < Pgpm::Package
+  github "tembo-io/pgmq"
+
+  def source
+    Pathname(File.join(super, "pgmq-extension"))
+  end
+
+  def pgxn_meta_json_path
+    File.join(source, "META.json.in")
+  end
+
+  def pgxn_meta_json
+    @pgxn_meta_json ||= Oj.load(File.read(pgxn_meta_json_path).gsub(/@@VERSION@@/, version.to_s))
+  end
+
+  def source_url_directory_name
+    "pgmq-#{version}/pgmq-extension"
+  end
+end