Create migration for adding an rpush app for webpush

db/migrate/20220909220449_add_webpush_app.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require "webpush"
+
+class AddWebpushApp < ActiveRecord::Migration[6.1]
+  def up
+    vapid_keypair = Webpush.generate_key.to_hash
+    app = Rpush::Webpush::App.new
+    app.name = "webpush"
+    app.certificate = vapid_keypair.merge(subject: "user@example.com").to_json # TODO: put an email address here
+    app.connections = 1
+    app.save!
+  end
+
+  def down
+    Rpush::Webpush::App.find_by(name: "webpush").destroy!
+  end
+end