Laravel docker improvements

[fideloper]

Depends on: #1142

What's Happening Here

1. We're using a different base container
2. Not Alpine based
3. This makes it easier to switch PHP version (changing the FROM: section)

We don't use the "official" PHP images as they're...sort of ridiculous. They come with long compilation steps for adding in basic modules (we'd end up hosting and managing base containers ourselves).

Similarish to Phoenix / Rails, we detect the php version the user runs locally, and use that version for the base container. Failing that, we fall back to php 8.0 (latest is 8.1) as it has the most broad compatibility.

TODO

• Use composer install instead of composer update
• Make PHP version changes easy
• Support cron tasks for Laravel scheduler
• Get PHP version the user has locally
  • Previously: Scan composer.lock to see what PHP version we need to support
• Support octane (swoole and roadrunner)

To Do Elsewhere

To do in the docs:

• Document [[processes]] section to run cron / worker instead of having it all in one container
  • Note this is a change from having it all run in one container
• Document [build] arguments PHP_VERSION and NODE_VERSION