Add data attributes to Summary Card rows

This allows users to add data attributes (for example, when initialising
Javascript modules) to individual rows

app/views/govuk_publishing_components/components/_summary_card.html.erb

@@ -28,7 +28,7 @@
         <%= tag.div class: "govuk-summary-card__content" do %>
           <%= tag.dl class: "govuk-summary-list" do %>
             <% rows.each do |row| %>
-              <%= tag.div class: "govuk-summary-list__row" do %>
+              <%= tag.div class: "govuk-summary-list__row", data: row[:data] do %>
                 <%= tag.dt class: "govuk-summary-list__key" do %>
                   <%= row[:key] %>
                 <% end %>

app/views/govuk_publishing_components/components/docs/summary_card.yml

@@ -91,3 +91,13 @@ examples:
             - label: View
               href: "#1"
               opens_in_new_tab: true
+  with_row_data_attributes:
+    description: |
+      Data attributes can be passed to individual rows within the component as shown.
+    data:
+      title: Title
+      rows:
+        - key: key one
+          value: value1
+          data:
+            module: "something"

spec/components/summary_card_spec.rb

@@ -154,4 +154,19 @@ def component_name
     assert_select '.govuk-summary-list__row .govuk-link[href="#1"]', text: "View One (opens in new tab)"
     assert_select '.govuk-summary-list__row .govuk-link[target="_blank"]', text: "View One (opens in new tab)"
   end
+
+  it "renders component with row data attributes" do
+    render_component(
+      title: "Title",
+      rows: [
+        {
+          key: "One",
+          value: "Value 1",
+          data: { module: "something" },
+        },
+      ],
+    )
+
+    assert_select ".govuk-summary-list__row[data-module='something']", text: /One/
+  end
 end