Ability to specify the image pull policy in the DockerComposeContainer

Hi!
I suggest adding the ability to specify the image pull policy to DockerComposeContainer. There is currently no way to tell DockerComposeContainer to pull the latest version of images from the remote repository when the image is already present in the local repository.

I believe that we can follow the analogy with the one implemented in org.testcontainers.containers.GenericContainer and add the method withImagePullPolicy to the DockerComposeContainer. In this case, the pull policy will be applied to all images that are found in docker-compose config files.
An alternative option would be, for example, specifying the image pull policy for individual services.

I am ready to implement this feature and await feedback.

从 DockerComposeContainer 开始，比较 GenericContainer 的 image-pull-policy 实现和 API。跟踪 Docker Compose 配置中的镜像是如何处理的，然后为这些镜像定义并测试所请求的策略行为，包括该策略是全局应用还是按服务应用。