How to set testcontainer image version/location

### Feature description

I need to override where  testcontainers/ryuk:0.7.0 is fetched from. I need to fetch that from my local Artifactory instead.

Normally when using testcontainers I can put a testcontainer.properties file with 
ryuk.container.image = myartifactory.example.org/testcontainers/ryuk:0.11.0
in src/test/resources but that doesn't work.

