ci: #3628628 Add GitLab CI

Nick Hoperequested to merge
issue/glightbox_media_video-3628628:codex/3628628-gitlab-ci into 1.0.x

Adds the standard Drupal GitLab CI template.

Issue: https://www.drupal.org/project/glightbox_media_video/issues/3628628

Validation: the pipeline starts automatically and passes with advisory warnings. Both Composer jobs pass. Existing PHPStan, PHPCS, ESLint, Stylelint and spelling findings were reviewed and can be addressed separately.

AI-Generated: Yes (Codex prepared the contribution using the official Drupal template.)

Edited by Nick Hope

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