[FR] Support loading a list of talosconfig instead of just one. #9491

Feature Request

Allow a "list" of absolute paths to load a talosconfig from.

Example:

export TALOSCONFIG=/cluster/talos/test/talosconfig:/cluster/talos/production/talosconfig:/cluster/talos/example/talosconfig

The delimiter in this case would be :.

talosctl would need to first loop over all instances, read the file and merge the configs with the default context being the first talosconfig read.

Description

Currently, unless I missed something, it is not possible to combine two or more talosconfig's without using talosctl.
The feature I am requesting is to replicate what kubectl supports when passed a list of paths to kubeconfig's.

Methods to get around this feature require using external programs or bash scripts to call talosctl directly.

kubectl has support for this feature:

• Allow kubeconfig option load a list of kubeconfig files kubernetes/kubectl#1626
• https://github.com/kubernetes/client-go/blob/d13452aae75e1039aa16dcfb5635b21b8399dbe0/tools/clientcmd/loader.go#L211

I am willing to help implement this feature if needed.