Add npm run dev to supervisord

[x7ryan]

The first thing I do after running my alias for ./vendor/bin/sail up -d when working on a project is open up a second terminal window and run my alias for ./vendor/bin/sail npm run dev to start the Vite watcher.

It occurred to me I don't have to manually run ./vendor/bin/sail artisan serve, sail does that automatically in the background, why not do the same for npm run dev? Its just a small supervisord config, so this PR does just that making one less step to get up and running in development.

NOTE: Existing projects using sail would have to run ./vendor/bin/sail build to get the update supervisord.conf in their container image.

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

If you feel absolutely certain that this code corrects a bug in the framework, please "@" mention me in a follow-up comment with further explanation so that GitHub will send me a notification of your response.

[x7ryan]

@taylorotwell FYI I updated a mistake in the title. Just in case you only read the title and had the wrong idea of what I was doing.

Seems I made the same mistake in the commit message too sorry, but if you look at the actual changes it is using dev NOT build. Sorry for any confusion.