This thought process taken to the extreme is what results in half the internet depending on leftPad and isOdd to function. Open source is great, but there is a difference between providing a utility vs adding needless layers of abstraction. It is the responsibility of the developer to figure out which is which rather than reach for the package manager for every task in front of them.
In this case, like I said earlier Docker already has a RESTful API. You don't need to replicate the entire feature set of Testcontainers, just make a couple of HTTP calls in your language of choice to achieve the exact same outcome.
