Ability to dynamically synthesize target account / environments

[huchister]

I need the CDK GitHub pipeline to dynamically generate a synthesis only for the target account(s) or environments.

I would like to use a native GitHub workflow that allows selecting the environment from a dropdown menu, passing in an AWS account ID, and selecting a particular branch to kick off the pipeline. Trying to find a way how to make this possible using current state of cdk-github-pipeline.