Add early return with specific message if database url does not exist in env file

What problem will this feature address?

Hello,

When i tried to set my development environment up i faced an issue on migration of PostgreSQL. There was no specific message about what did i do wrong so i struggled debugging the problem. If we add an early return to the migration file the problem will be prompted more specifically.

Describe the solution you'd like

const connectionString = process.env.DATABASE_URL!;

if (!connectionString) {
	throw new Error("DATABASE_URL is not set in env file");
}

Describe alternatives you've considered

const connectionString = process.env.DATABASE_URL!;

if (!connectionString) {
	throw new Error("DATABASE_URL is not set in env file");
}

Additional context

Try to run pnpm run dokploy:setup without DATABASE_URL. (Delete from env file or just pass the step of copying example env file.)

Will you send a PR to implement it?

Yes

Run pnpm run dokploy:setup without DATABASE_URL to reproduce the migration failure. Locate the migration file involved in that setup command, add the requested early error path, and confirm the missing variable produces the specific message instead of the existing failure.