Add .gitlab-ci.yml file to enable GitLab CI/CD pipeline in Webreleases Module
### Problem/Motivation Add a GitLab file to test the Webreleases module with the Webship-js tool and make sure it works perfectly in the Drupal environment ### Proposed resolution ### Checkpoints - [x] File an issue - [x] Addition for a new supported feature - [x] Testing to ensure no regression - [x] Automated unit testing coverage - [x] Automated functional testing coverage - [ ] UX/UI designer responsibilities - [ ] Readability - [ ] Accessibility - [ ] Performance - [ ] Security - [ ] Documentation - [x] Reviewed by human - [x] Code review by maintainers - [x] Full testing and approval - [x] Credit contributors - [x] Review with the product owner - [x] Release Notes - [x] Release ### API changes N/A ### Data model changes N/A ### Release notes snippet addition: [#3556429](https://git.drupalcode.org/project/webreleases/-/work_items/3556429) Add .gitlab-ci.yml file to enable GitLab CI/CD pipeline in Webreleases Module
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