When there are multiple Salesforce environments in the deployment pipeline, like Integration, Qa, Stage and Production, we would like to have ability to automate deployments to a specific environment, without having to select PR and promote changes manually. Most of the times SIT/Integration environment will be used for Developers to be able to perform integration testing, where we do not want someone like a Lead to review and promote PR manually. It will be beneficial to deploy the changes automatically, as soon as someone creates the PR to the Integration environment.