Workaround for Middleman deploy issue

Ref: karlfreeman/middleman-deploy#114
Ref: egardner/larb-publishing-course@d956942

bin/site

@@ -16,7 +16,8 @@ function build_site {
 }
 
 function publish_site {
-  _middleman deploy --build-before
+  _middleman deploy
+  git checkout build
 }
 
 function print_help {

config.rb

@@ -1,5 +1,6 @@
 require 'rack/utils'
 require 'middleman-syntax'
+require_relative "./extensions/build_cleaner"
 
 ###
 # Compass
@@ -192,4 +193,5 @@ def hanami_version
 
   # Or use a different image path
   # set :http_prefix, "/Content/images/"
+  activate :build_cleaner
 end

extensions/build_cleaner.rb

@@ -0,0 +1,9 @@
+#lib/build_cleaner.rb
+class BuildCleaner < Middleman::Extension
+  def initialize(app, options_hash={}, &block)
+    super
+    FileUtils.rm_rf app.config[:build_dir]
+  end
+end
+
+::Middleman::Extensions.register(:build_cleaner, BuildCleaner)