I believe the OP is referring to "local stack" i.e. being able to run a single command e.g. `make up` (if you're using makefiles) to spawn a local environment and run a "local" version of the site i.e. serving on localhost.
Having such scripts enables one to quickly setup a local environment to make changes and test them before submitting a Pull Request.
Having such scripts enables one to quickly setup a local environment to make changes and test them before submitting a Pull Request.