Add basic set of error pages

lib/tasks/app.rake

@@ -0,0 +1,29 @@
+desc "Generates error pages"
+task generate_error_pages: :environment do
+  # unless Rails.env.production?
+  #   puts "Skipping generate_error_pages page generation outside production"
+  #   next
+  # end
+
+  Rails.application.config.action_controller.perform_caching = false
+  pages = {
+    "error_pages/not_found" => "404.html",
+    "error_pages/unprocessable_content" => "422.html",
+    "error_pages/internal_server_error" => "500.html"
+  }
+
+  pages.each do |page, output|
+    puts "Generating #{output}..."
+    outpath = Rails.root.join("public", output)
+    renderer = ApplicationController.renderer.new(http_host: ENV.fetch("APP_HOST") { "jwa11y.top" }, https: true)
+    html = renderer.render(template: page, layout: "layouts/errors")
+    if html.present?
+      File.delete(outpath) if File.exist?(outpath)
+      File.open(outpath, "w") do |f|
+        f.write(html)
+      end
+    else
+      puts "Error generating #{output}!"
+    end
+  end
+end