Allows merging two Talos configs into one. Merges the config in whatever
is set by TALOSCONFIG or ~/.talos/config.
Signed-off-by: Artem Chernyshev <artem.0xD2@gmail.com>
Bonus to `talosctl config merge`.
Got that idea after using talosctl for a weekend.
I feel that can be a good addition to have a command that can list existing
contexts in a table view, which is similar to what `kubectl config get-contexts`
does. To avoid going through the file which has all the certs and such.
Called it just `contexts` to align with whatever we have now (to switch
context you need to use `talosctl config context`).
Signed-off-by: Artem Chernyshev <artem.0xD2@gmail.com>