[crabbone]

This may work for something simple, but a typical database cluster setup will be impossible / impractical to try to emulate in containers because you'd need to configure a lot of things not normally available inside containers (s.a. how storage is attached, how memory is allocated).

Since OP mentioned DBT (kind of weird, hopefully, it's at least DBT2, since DBT is very old), they mean to test the productivity of the system rather than correctness of some queries (typical tests that deal with workloads similar to DBT2 are, eg. pgbench). Running pgbench over a database setup in a container will tell you nothing / might just confuse you, if you don't understand the difference between how database is meant to be setup and what happens in container.