We handled it by spinning up everything via terraform and forcing dependency on those modules & resource bundles. Separate sets for each cloud provider and it

We handled it by spinning up everything via terraform and forcing dependency on those modules & resource bundles. Separate sets for each cloud provider and it all gets code reviewed by one team. Essentially we built a platform on top of each cloud. The difficulty there is groking the differences in network topology and access control and building something functionally equivalent everywhere.