ci(danger): run Danger from composer instead of the latest container image

[Jozsef Damokos (jozsefdamokos)]

• The ghcr.io/shyim/danger-php:latest image was rebuilt for 0.3.14 on a base whose PHP needs a newer glibc than the image ships, so danger ci dies before it starts and every Danger run fails
• Install Danger from composer as core does: vendor-bin/danger-php/composer.json pins shyim/danger-php to ^0.3.14, the job sets up PHP 8.2, installs that directory and runs vendor-bin/danger-php/vendor/bin/danger ci
• Declare the token permissions the job needs

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.35%. Comparing base (8dd27d4) to head (adbb73b).

Additional details and impacted files

@@            Coverage Diff            @@
##              trunk     #236   +/-   ##
=========================================
  Coverage     65.35%   65.35%           
  Complexity     4786     4786           
=========================================
  Files           654      654           
  Lines         21753    21753           
=========================================
  Hits          14217    14217           
  Misses         7536     7536           

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