Handle new yarn 4 requirement

[rfay]

There are a couple of problems with the new yarn v4 requirements for core.

This PR

• enables corepack
• Used ddev yarn in the core directory, which seems to work whereas the ddev exec yarn --cwd does not, which I assume is a bug in yarn/node

Test with

ddev get https://github.com/rfay/ddev-drupal-core-dev/tarball/20240324_yarn_problems

[T-Fletcher]

This version still throws a yarn error. I was able to run your branch after running ddev exec corepack enable though.

$ git clone https://git.drupalcode.org/project/drupal.git drupal-test6
$ cd drupal-test6/ && ddev config --project-type=drupal10
$ cd drupal-test6
$ ddev start
$ ddev get https://github.com/rfay/ddev-drupal-core-dev/tarball/20240324_yarn_problems
Downloading https://github.com/rfay/ddev-drupal-core-dev/tarball/20240324_yarn_problems 
20240324_yarn_problems_1584679238.tar.gz 12.43 KiB / ? [-----=---------] 127.30% 0s 

Installing project-level components: 
👍 web-build/Dockerfile 
👍 docker-compose.core-dev-selenium.yaml 
👍 core-dev/phpunit-firefox.xml 
👍 core-dev/phpunit-chrome.xml 
👍 commands/web/drupal 
👍 commands/web/phpunit 
👍 commands/web/nightwatch 
👍 core-dev/gitignore 
👍 core-dev/.env 
👍 core-dev/src/Command/AdminLoginCommand.php 
👍 core-dev/src/Command/BootCommand.php 
👍 core-dev/src/Command/CacheCommand.php 
👍 core-dev/src/Command/TestCommand.php 
👍 core-dev/src/Command/TestBrowserCommand.php 
👍 core-dev/src/Command/UninstallCommand.php 

Executing post-install actions: 
error This project's package.json defines "packageManager": "[email protected]". However the current global version of Yarn is 1.22.21.

Presence of the "packageManager" field indicates that the project is meant to be used with Corepack, a tool included by default with all official Node.js distributions starting from 16.9 and 14.19.
Corepack must currently be enabled by running corepack enable in your terminal. For more information, check out https://yarnpkg.com/corepack.
Failed to run yarn : exit status 1
 
👎  
Could not process post-install action (6) '' 

[rfay]

Ah, you have to do a ddev restart after ddev get https://github.com/rfay/ddev-drupal-core-dev/tarball/20240324_yarn_problems

I guess we need to add that to the add-on, or else do this a different way. Thanks @T-Fletcher

[rfay]

Thanks for the careful look @T-Fletcher - Please try again with

ddev get https://github.com/rfay/ddev-drupal-core-dev/tarball/20240324_yarn_problems

Also, please use the updated steps in your https://github.com/justafish/ddev-drupal-core-dev/pull/16/files

[T-Fletcher]

Thanks @rfay, I can confirm your latest version works for me with the updated steps

[justafish]

Thank you!