Drizzle and Svelte Kit : bug with env variables ?

This is a replica of a bug I came across with SvelteKit and my first time using Drizzle. Since the Drizzle configuration file need a very SECRET connection URL, I thought, hum, let's put it inside .env and make the configuration file drizzle.config.ts a server file.

How do I see the bug ?

I put the .env file there, and you can just run npm run build, and then try to generate migrations by using npm run generate

What works then ?

I don't know but I ended up using dotenv for drizzle.config.ts to access the private environment variable. Also putting the hard-coded value of the DUMMY_SECRET_VARIABLE variable works, but that's not very secure, is it ?