Add secondary card option

This adds the ability to render a card component using the secondary
styles.

app/components/app_card_component.rb

@@ -28,11 +28,12 @@ class AppCardComponent < ViewComponent::Base
   renders_one :heading
   renders_one :description
 
-  def initialize(colour: nil, link_to: nil)
+  def initialize(colour: nil, link_to: nil, secondary: false)
     super
 
     @link_to = link_to
     @colour = colour
+    @secondary = secondary
   end
 
   private
@@ -43,7 +44,8 @@ def card_classes
       "app-card",
       ("nhsuk-card--feature" if @colour.present?),
       ("app-card--#{@colour}" if @colour.present?),
-      ("nhsuk-card--clickable" if @link_to.present?)
+      ("nhsuk-card--clickable" if @link_to.present?),
+      ("nhsuk-card--secondary" if @secondary)
     ].compact.join(" ")
   end
 

spec/components/app_card_component_spec.rb

@@ -34,4 +34,10 @@
     it { should have_css(".nhsuk-card--feature") }
     it { should have_css(".app-card--red") }
   end
+
+  context "when secondary" do
+    before { render_inline(described_class.new(secondary: true)) }
+
+    it { should have_css(".nhsuk-card--secondary") }
+  end
 end