add CI/CD

when a build is succeeded the minifiled js files and the css file should be automatically placed in WSSearchFront/module folder and the version should be bumped in WSSearchFront/extension.json

related links

https://medium.com/nerd-for-tech/auto-bump-apps-versions-and-releases-using-gitlab-pipeline-e32f1d7fa3ee https://about.gitlab.com/blog/2017/09/12/vuejs-app-gitlab/

https://stackoverflow.com/questions/59415183/add-artifact-to-repository-in-gitlab-ci-yml