[13.x] Feat (Added): Provision to specify default connection for migration

[aagjalpankaj]

Closes discussion #54035

What it does?

Allows provision to specify default connection for migrations (by specifying config value database.migrations.connection).

So the priority for connection will be as below (Highest to Lowest):

1. Migration-specific connection: Set via $connection property or Schema::connection() in the migration file (Existing)
2. CLI option: --database=<connection> when running php artisan migrate (Existing)
3. Default migration connection: database.migrations.connection configuration value (new feature)
4. Default connection: database.default configuration value (Existing)

Why?

I have seen Laravel applications following separate connection for application (DML permissions) and migration (DDL permissions) due to some architectural decisions.

• Mentioning Schema::connection('connection')-> while writing each migration or running artisan migrate --database=<connection> is not always handy.
• When we setup project initially, the migrations table is created using default application connection.
• Some automation scripts like serversideup runs artisan migrate command without allowing --database option.

This feature provides a "set once, use everywhere" solution through configuration, eliminating manual overhead while maintaining full backward compatibility.

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[taylorotwell]

Thanks for your pull request to Laravel!

Unfortunately, I'm going to delay merging this code for now. To preserve our ability to adequately maintain the framework, we need to be very careful regarding the amount of code we include.

If applicable, please consider releasing your code as a package so that the community can still take advantage of your contributions!