[BUG] Required PHP modules are missing

[eliashaeussler]

PHP version

not relevant

Composer version

not relevant

Package version

latest

Operating system

Ubuntu

Current behavior

When running composer create-project cpsit/project-builder on Ubuntu, I get an exception because the following PHP module requirements cannot be satisified:

• ext-mbstring
• ext-simplexml

We should check whether these dependencies are actually required. In addition, we should verify that these are not installed by default with apt install php.

Expected behavior

The command succeeds on all operating systems.

Steps to reproduce

No response

Additional context

No response