honest question: how are you writing integration tests? We are writing these as separate test suite often with the same test style. And in this scenario testcontainers are very valuable.
But at $WORKPLACE we often use pytest-xprocess to start the required app in the same container where the tests run. It's probably the easiest way mostly because a custom wrapper does all the heavy lifting (starts the app, checks that it is running and responding to requests before the tests start, correctly terminates it when tests end).
Really, you use testcontainers so that you can manage everything for your test with a single build command, instead of running something extra, then running your tests, then shutting down your docker containers. Plus, with it integrated into your test suites, you can run code against your docker containers on setup/teardown, before/after container start, before/after each test, etc.