Introduce `inline_svg` gem, minimal usage, prep for material design icons (#29612)

Gemfile

@@ -59,6 +59,7 @@ gem 'http', '~> 5.1'
 gem 'http_accept_language', '~> 2.1'
 gem 'httplog', '~> 1.6.2'
 gem 'idn-ruby', require: 'idn'
+gem 'inline_svg'
 gem 'kaminari', '~> 1.2'
 gem 'link_header', '~> 0.0'
 gem 'mime-types', '~> 3.5.0', require: 'mime/types/columnar'

Gemfile.lock

@@ -350,6 +350,9 @@ GEM
       rainbow (>= 2.2.2, < 4.0)
       terminal-table (>= 1.5.1)
     idn-ruby (0.1.5)
+    inline_svg (1.9.0)
+      activesupport (>= 3.0)
+      nokogiri (>= 1.6)
     io-console (0.7.2)
     irb (1.12.0)
       rdoc
@@ -865,6 +868,7 @@ DEPENDENCIES
   httplog (~> 1.6.2)
   i18n-tasks (~> 1.0)
   idn-ruby
+  inline_svg
   irb (~> 1.8)
   json-ld
   json-ld-preloaded (~> 3.2)

app/helpers/application_helper.rb

@@ -114,7 +114,7 @@ module ApplicationHelper
   end
 
   def check_icon
-    content_tag(:svg, tag.path('fill-rule': 'evenodd', 'clip-rule': 'evenodd', d: 'M16.704 4.153a.75.75 0 01.143 1.052l-8 10.5a.75.75 0 01-1.127.075l-4.5-4.5a.75.75 0 011.06-1.06l3.894 3.893 7.48-9.817a.75.75 0 011.05-.143z'), xmlns: 'http://www.w3.org/2000/svg', viewBox: '0 0 20 20', fill: 'currentColor')
+    inline_svg_tag 'check.svg'
   end
 
   def visibility_icon(status)

app/javascript/images/check.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor">
+    <path fill-rule="evenodd" clip-rule="evenodd"
+        d="M16.704 4.153a.75.75 0 01.143 1.052l-8 10.5a.75.75 0 01-1.127.075l-4.5-4.5a.75.75 0 011.06-1.06l3.894 3.893 7.48-9.817a.75.75 0 011.05-.143z" />
+</svg>

config/initializers/propshaft.rb

@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+Rails.application.config.assets.paths << Rails.root.join('app', 'javascript', 'images')