add exec support for k8s

[Tom Haddon]

The operator framework has some pretty interesting support for debugging code using the new "juju debug-code" command, but it's not currently possible to use it on k8s because there isn't yet support for exec on k8s, AIUI.

As noted in discussions with the operator developers the juju agent looks for special files to decide to run in debug mode, so we should be able to inject those via kubectl.

[Gustavo Niemeyer (niemeyer)]

We're working on some relevant improvements to the interactions between juju and k8s, which will make that sort of operation easier to handle. I suggest revisiting this issue after that's done.

[John A Meinel (jameinel)]

related to https://bugs.launchpad.net/juju/+bug/1875422 which is about general ssh/shell access to k8s nodes.

[Pen Gale (pengale)]

Marking as "confirmed" and "high", as this feature most likely fits in with our plans for k8s over the next few cycles.

[Canonical Juju QA Bot (juju-qa-bot)]

This bug has not been updated in 2 years, so we're marking it Low importance. If you believe this is incorrect, please update the importance.