feat(migrate): add AddCoverToPosts, down and CreateComments

examples/blog/db/migrate/20260906000007_create_likes.rb

@@ -0,0 +1,14 @@
+class CreateLikes < Prism::Orm::Migration
+  def up
+    create_table :likes do |t|
+      t.integer :user_id
+      t.integer :likeable_id
+      t.string :likeable_type
+      t.timestamps
+    end
+  end
+
+  def down
+    drop_table :likes
+  end
+end