Support for opencode in `docker sandbox create`

[applike-ss]

Description

As discussed in #6734 the development for docker sandboxes subcommand seems to be private (sadly!).

I would like to request support for opencode with this issue.

[applike-ss]

@thaJeztah could you ping the right people if you agree?

[thaJeztah]

Thanks for reporting.

The sandbox command is implemented as a CLI plugin, and the code is not maintained in this repository; unfortunately, the repository for the plugin is closed-source, so I cannot transfer this ticket, but let me see if I can find someone to look if this would be possible (and where to best report issues with the plugin).

cc @kiview @rcjsuen

[applike-ss]

Thank you 👍