Need to review and update our release process

Hi, our solution www.caracal.life is an e-health solution dedicated to hypertension monitoring. It complies with European Union directives on data management and architecture design of the solution, thus our architecture is - an app, published on the stores - a front-end and back-end, with test server on OVH and production server in a special hoster certified by Ministry of Health in France We store the code in bitbucket and manage code versions in bitbucket our stack is: Backend : PHP5, Zend Framework 2 + Doctrine ODM (MongoDb) Frontend web: good knowledge of HTML/Javascript + Angular Mobile: Xamarin/C# We need to review and update our realse process, as we are not sure today of how to use bitbucket and post update in the production environment.