fix: correct K3S_LAB assignment in Makefile for proper path resolution

Author: KevinDeBenedetti

Makefile

@@ -17,7 +17,7 @@ KUBECONFIG_CONTEXT  ?= k3s-lab
 K3S_VERSION         ?= v1.32.2+k3s1
 
 # Root of this repo — used by run-local-script / run-remote-script in local mode
-K3S_LAB     := $(abspath $(dir $(MAKEFILE_LIST)))
+K3S_LAB     := $(abspath $(dir $(firstword $(MAKEFILE_LIST))))
 K3S_LAB_RAW := https://raw.githubusercontent.com/KevinDeBenedetti/k3s-lab/main
 
 # Terminal colors