Configure builds

- Create .keep
- Update manifest file to use /builds directory
- Ignore /builds & /public/assets
- Add initialiser which supresses dependency deprecation warnings &
imports all stylesheets from GOV.UK Publishing Components

.gitignore

@@ -15,6 +15,8 @@
 
 # Ignore compiled assets
 /public/assets
+/app/assets/builds/*
+!/app/assets/builds/.keep
 
 # Ignore all logfiles and tempfiles.
 /log/*.log
@@ -29,4 +31,4 @@
 !.yarn/plugins
 !.yarn/releases
 !.yarn/sdks
-!.yarn/versions
+!.yarn/versions

app/assets/config/manifest.js

@@ -1,4 +1,3 @@
 //= link_tree ../images
-//= link application.css
+//= link_tree ../builds
 //= link application.js
-//= link historical-edition.css

config/application.rb

@@ -13,6 +13,7 @@
 require "action_view/railtie"
 # require "action_cable/engine"
 require "rails/test_unit/railtie"
+require "sprockets/railtie"
 
 # Require the gems listed in Gemfile, including any gems
 # you've limited to :test, :development, or :production.

config/initializers/dartsass.rb

@@ -0,0 +1,9 @@
+APP_STYLESHEETS = {
+  "application.scss" => "application.css",
+  "historical-edition.scss" => "historical-edition.css",
+}.freeze
+
+all_stylesheets = APP_STYLESHEETS.merge(GovukPublishingComponents::Config.all_stylesheets)
+Rails.application.config.dartsass.builds = all_stylesheets
+
+Rails.application.config.dartsass.build_options << " --quiet-deps"