KUBECONFIG ignored when running in-cluster

[frezbo]

When kubestr is run inside a k8s pod, explicitly specifying KUBECONFIG has no effect

kubectl behavior

/ # kubectl get pods
Error from server (Forbidden): pods is forbidden: User "system:serviceaccount:monito-rss:default" cannot list resource "pods" in API group "" in the namespace "monito-rss"
/ # KUBECONFIG=/tmp/k kubectl get pods
NAME                              READY   STATUS    RESTARTS   AGE
redis-0                           1/1     Running   0          4h44m

kubestr behavior

/ # kubestr 

**************************************
  _  ___   _ ___ ___ ___ _____ ___
  | |/ / | | | _ ) __/ __|_   _| _ \
  | ' <| |_| | _ \ _|\__ \ | | |   /
  |_|\_\\___/|___/___|___/ |_| |_|_\

Explore your Kubernetes storage options
**************************************
Kubernetes Version Check:
  Valid kubernetes version (v1.20.2+k3s1)  -  OK

RBAC Check:
  Kubernetes RBAC is enabled  -  OK

Aggregated Layer Check:
  The Kubernetes Aggregated Layer is enabled  -  OK

Error listing provisioners: storageclasses.storage.k8s.io is forbidden: User "system:serviceaccount:monito-rss:default" cannot list resource "storageclasses" in API group "storage.k8s.io" at the cluster scope
Error: Error listing provisioners: storageclasses.storage.k8s.io is forbidden: User "system:serviceaccount:monito-rss:default" cannot list resource "storageclasses" in API group "storage.k8s.io" at the cluster scope
/ # KUBECONFIG=/tmp/k kubestr

**************************************
  _  ___   _ ___ ___ ___ _____ ___
  | |/ / | | | _ ) __/ __|_   _| _ \
  | ' <| |_| | _ \ _|\__ \ | | |   /
  |_|\_\\___/|___/___|___/ |_| |_|_\

Explore your Kubernetes storage options
**************************************
Kubernetes Version Check:
  Valid kubernetes version (v1.20.2+k3s1)  -  OK

RBAC Check:
  Kubernetes RBAC is enabled  -  OK

Aggregated Layer Check:
  The Kubernetes Aggregated Layer is enabled  -  OK

Error listing provisioners: storageclasses.storage.k8s.io is forbidden: User "system:serviceaccount:monito-rss:default" cannot list resource "storageclasses" in API group "storage.k8s.io" at the cluster scope
Error: Error listing provisioners: storageclasses.storage.k8s.io is forbidden: User "system:serviceaccount:monito-rss:default" cannot list resource "storageclasses" in API group "storage.k8s.io" at the cluster scope