[Request] Agent auto-config for multiple containers in one Pod

If I have an application where multiple Java containers are deployed together within a single Pod, and I want to use the Operator autoconfig feature to dynamically attach the Cryostat Agent, then there is currently no way for me to get the Agent attached to all of my containers. By default it will choose the first container in the Pod, or I can use a label to specify which container to use by name. It would be good to have some way to use the label to specify multiple names, ex. by comma-separated name values.

Start with the Operator autoconfig path that selects the first container or reads the container-name label. Determine how multiple container names should be represented and validated. Done means the label can target multiple Java containers in one Pod and the Cryostat Agent attaches to each, with coverage for the selection behavior.

Written by the indexing model from the issue text.