sam: Add kubectl completion and "k" alias

sam/configuration.nix

@@ -139,6 +139,12 @@
     programs.bash = {
       enable = true;
       historyControl = [ "ignoredups" "ignorespace" ];
+      initExtra = ''
+        # https://kubernetes.io/docs/reference/kubectl/quick-reference/#bash
+        source <(kubectl completion bash)
+        alias k=kubectl
+        complete -o default -F __start_kubectl k
+      '';
     };
 
     programs.go = {