Trigger pipeline step conditionally based on environment variables

We have a standard git-flow for our projects, mainly triggering pipeline by branch. Some projects are hosted on AWS, others not. The deployment steps for AWS and a VPS that accepts a git push require different images and scripts to run. Some projects mix and match between AWS and VPS for the different environments.

It would be helpful to have all the deployment steps in one config file and be able to choose which are triggered based on a combination of the git branch and BB repository variables.