What problem does this address?

Currently when adding custom scripts to a template config, npm lifecycle scripts (i.e. postinstall) are being ignored. They're added to your package.json file but they aren't executed during the initial set up.

Here's an example config from WooCommerce: https://github.com/woocommerce/woocommerce/blob/trunk/packages/js/create-woo-extension/index.js#L18

What is your proposed solution?

Add manual support for all- or a subset- of lifecycle scripts to the manual generation process.

CC @ryanwelcher