fix: drizzle config not loading .env.local

[duaneadam]

The generated project uses .env.local, but dotenv defaults to .env. This causes drizzle-kit commands to fail.

This PR fixes that by updating drizzle.config.ts to load .env.local.

Example error:

> drizzle-kit migrate

No config path provided, using default 'drizzle.config.ts'
Reading config file '/Users/duane/Projects/my-project/drizzle.config.ts'
 Error  Please provide required params for Postgres driver:
    [x] url: undefined