Use proper kube context and kube config in helmfile (#3917)

## Motivation

When deploying multiple networks in parallel, we need to make sure that helmfile is using the proper kube context and kube config, to prevent it from trying to deploy to an incorrect cluster.

## Proposal

Pass those in and use them when appropriate

## Test Plan

Deployed networks in parallel using local SSD, it works.

## Release Plan

- Nothing to do / These changes follow the usual release cycle.

Author: ndr-ds

kubernetes/linera-validator/helmfile.yaml

@@ -4,10 +4,13 @@ environments:
       - writeToGrafanaCloud: {{ env "LINERA_WRITE_TO_GRAFANA_CLOUD" | default "false" }}
         validatorLabel: {{ env "LINERA_VALIDATOR_LABEL" | default (printf "local-%s" (env "USER")) }}
         usingLocalSsd: {{ env "LINERA_HELMFILE_SET_USING_LOCAL_SSD" | default "false" }}
+        kubeContext: {{ env "LINERA_HELMFILE_SET_KUBE_CONTEXT" | default "" }}
+        kubeConfigPath: {{ env "KUBECONFIG" | default "" }}
 
 helmDefaults:
   wait: true
   recreatePods: false
+  kubeContext: {{ .Values.kubeContext | quote }}
 
 {{- if .Values.usingLocalSsd }}
 hooks:
@@ -17,15 +20,26 @@ hooks:
     args:
       - -c
       - |
+        set -euxo pipefail
+
+        kube_args=(
+          {{- if .Values.kubeContext }}
+          --context {{ .Values.kubeContext }}
+          {{- end }}
+          {{- if .Values.kubeConfigPath }}
+          --kubeconfig {{ .Values.kubeConfigPath }}
+          {{- end }}
+        )
+
         echo "Ensuring RAID0 and Local‑CSI driver are setup..."
 
-        kubectl create -f ./scylla-setup/gke-daemonset-raid-disks.yaml
-        kubectl -n default rollout status daemonset/gke-raid-disks
+        kubectl "${kube_args[@]}" apply -f ./scylla-setup/gke-daemonset-raid-disks.yaml
+        kubectl "${kube_args[@]}" -n default rollout status daemonset/gke-raid-disks
 
-        kubectl apply -f ./scylla-setup/local-csi-driver
-        kubectl -n local-csi-driver rollout status daemonset.apps/local-csi-driver
+        kubectl "${kube_args[@]}" apply -f ./scylla-setup/local-csi-driver
+        kubectl "${kube_args[@]}" -n local-csi-driver rollout status daemonset.apps/local-csi-driver --timeout=5m
 
-        kubectl apply -f ./scylla-setup/local-ssd-sc.yaml
+        kubectl "${kube_args[@]}" apply -f ./scylla-setup/local-ssd-sc.yaml
 {{- end }}
 
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