Currently, when you create a pipeline run and check the logs of a node, the default container is not "main", which contains the information that users don't care about. We should set the default container to "main", so every time when you switch to the logs table, it always falls on the main container of that pod.

Reproduce:

1. Import the hello world pipeline
2. Create a run using the pipeline
3. Check the pod logs, the "main" container is not default