Refactor to replace Swift Mailer with Symfony mailer and the upgrade to...

See merge request !23

- Use the correct default image (PHP 8.0)
- Remove the not needed and not used before_* templates
- Add a prefer lowest job for each supported PHP version

Refactor to replace Swift Mailer with Symfony mailer and the upgrade to Laravel 9 (this will be a major release)

Resolve "Support PHP 8.1"

Closes #13

See merge request !22

Setup the codeclimate steps

See merge request !21

Only require beechit/json-to-code-climate-subset-converter on the specific job to prevent problems with the PHP versions

Use an artifact for the vendor map to speedup composer

See merge request !20

Psalm

See merge request !19

Add junit and cobertura reports

See merge request !18

Use a PHP 8.0 images specific for 8.0 and not 8

See merge request !17

PHP 8 support

See merge request !16

Small cleanups

See merge request !15