add submissions dashboard view

app/controllers/submissions_dashboard_controller.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+class SubmissionsDashboardController < ApplicationController
+  load_and_authorize_resource :submission, parent: false
+
+  def index
+    @submissions = @submissions.joins(:template)
+
+    @submissions = @submissions.where(archived_at: nil)
+                               .where(templates: { archived_at: nil })
+                               .preload(:created_by_user, template: :author)
+
+    @submissions = Submissions.search(@submissions, params[:q], search_template: true)
+
+    @submissions = @submissions.pending if params[:status] == 'pending'
+    @submissions = @submissions.completed if params[:status] == 'completed'
+
+    @pagy, @submissions = pagy(@submissions.preload(:submitters).order(id: :desc))
+  end
+end