Rebuild frontend on deploy / publish

Rakefile.rb

@@ -1,4 +1,6 @@
 require_relative "rakelib/builders"
+load "twenty-frontend/tasks/nanoc.rake"
+
 namespace :gem do
   task :gemspec, [:version] do |t, args|
     GemSpec.call(args[:version])
@@ -8,7 +10,7 @@ namespace :gem do
     Copy.call(args[:version])
   end
 
-  task :build, [:version] => [:copy] do |t, args|
+  task :build, [:version] => ["nanoc:clean", "nanoc:build", :copy] do |t, args|
     Build.call(args[:version])
   end
 

twenty-frontend/tasks/nanoc.rake

@@ -1,10 +1,21 @@
 namespace :nanoc do
+  cwd = File.realpath File.join(__dir__, "..")
+
+  desc "Clean the build/ directory"
+  task :clean do
+    Dir.chdir(cwd) do
+      sh "rm -rf build"
+    end
+  end
+
   desc "Produce the build/ directory"
   task :build do
-    # FIXME: discover why rm -rf build/css/ is needed.
-    ENV["NODE_ENV"] = "production"
-    sh "rm -rf build/css/"
-    sh "nanoc co"
+    Dir.chdir(cwd) do
+      # FIXME: discover why rm -rf build/css/ is needed.
+      ENV["NODE_ENV"] = "production"
+      sh "rm -rf build/css/"
+      sh "bundle exec nanoc co"
+    end
   end
 
   desc "Produce the build/ directory on-demand"