Add ./vendor/bin to the path in Dockerfile

[meditto]

I added this line to Dockerfile ENV PATH "$PATH:.:./vendor/bin:./node_modules/.bin"
With the expanded PATH variable, developers can run sail shell then execute key commands, such as pest and phpstan or running artisan without prefixing it with the php keyword.

[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.

[meditto]

Hey @taylorotwell ,
I just wanted to give a shoutout for the awesome work you're doing in keeping Laravel top-notch for us developers. Big thanks!
Talking about the pull request, I totally get your point. Even though it's just one line, it improves the developer experience. I've been adding this line manually in my sail files, and having it by default would be super cool.