Add Link Zammad setup file

docker/zammad/setup.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+base_path = '/opt/zammad/contrib/link/addons'
+
+packages = Dir.glob("#{base_path}/*")
+
+puts "Available packages: #{packages}"
+puts "Installed packages: #{Package.all}"
+
+packages.each do |package|
+  puts "Installing #{package} package..."
+  Package.install(file: package, reinstall: true)
+rescue StandardError => e
+  puts "Error #{e.message}"
+end
+