Refactor to use a dry-run config instead of cfg(test)

Refactor to use a dry-run config instead of cfg(test)

This ensures that each build will support the testing design of "dry
running" builds. It's also checked that a dry run build is equivalent
step-wise to a "wet" run build; the graphs we generate when running are
directly compared node/node and edge/edge, both for order and contents.