[BUG] Github CI lint action failing for new project

[y8a5y]

TL;DR: By default on new projects the GH action "lint" is not working.

Base output:

Error: Your lock file does not contain a compatible set of packages. Please run composer update.

Problem 1
  - symfony/framework-bundle is locked to version v8.0.5 and an update of this package was not requested.
  - symfony/framework-bundle v8.0.5 requires ext-xml * -> it is missing from your system. Install or enable PHP's xml extension.

I tried to add COMPOSER_IGNORE_PLATFORM_REQS: 1 to the job's env as prescribed here but that only shifted the issue.

I now get:

Script cache:clear returned with error code 1
!!  
!!  In FrameworkExtension.php line 507:
!!                                                                                 
!!    Session support cannot be enabled as the session extension is not installed  
!!    . See https://php.net/session.installation for instructions.

I did not find a fix yet but I wanted to let you know about it

Steps to reproduce:

1. start a new symfony project
2. follow Using Symfony Docker with an existing project
3. push to your GH repo and wait for the CI to fail