Make Drone CI configurable

app/views/admin/settings/services/_droneci.html.erb

@@ -0,0 +1,16 @@
+<h3>Drone CI</h3>
+<ul role="list">
+  <%= render FormElements::FieldsetToggleComponent.new(
+    form: f,
+    attribute: :droneci_enabled,
+    enabled: Setting.droneci_enabled?,
+    title: "Enable Drone CI integration",
+    description: "Drone CI configuration present and features enabled"
+  ) %>
+  <% if Setting.droneci_enabled? %>
+    <%= render FormElements::FieldsetResettableSettingComponent.new(
+          key: :droneci_public_url,
+          title: "Public URL"
+        ) %>
+  <% end %>
+</ul>