feat(migrate): add AddCoverToPosts, down and CreateComments

examples/blog/db/migrate/20260906000003_create_users.rb

@@ -0,0 +1,13 @@
+class CreateUsers < Prism::Orm::Migration
+  def up
+    create_table :users do |t|
+      t.string :email
+      t.string :password_digest
+      t.timestamps
+    end
+  end
+
+  def down
+    drop_table :users
+  end
+end