[k8s] Remote identity support when multiple contexts are configured

[romilbhardwaj]

If I have multiple Kubernetes contexts configured in my allowed_contexts, I currently do not have a way to specify a different service account to be used (kubernetes.remote_identity) for each of these contexts.

E.g.:

kubernetes:
  allowed_contexts:
    - context1 # Uses service account named "sa1"
    - context2 # Uses service account named "sa2"
  remote_identity: # No way to specify different service accounts for each context.

We may need to make remote_identity of type Union[dict[str,str], str] which can either contain a dict mapping context names to service accounts or a singular service account name to be used for all contexts (current behavior).

[romilbhardwaj]

Feature added in #4188, but needs documentation.