revert: restore base64 -d in kubectl/configure (fetch-secret outputs base64)

kubectl/configure/action.yml

@@ -2,7 +2,7 @@ name: Configure Kubectl
 description: Configure kubectl for use with Kubernetes
 inputs:
   K8S_CONFIG:
-    description: "The Kubernetes config (plain YAML)"
+    description: "The base64-encoded Kubernetes config"
     required: true
   K8S_NAMESPACE:
     description: "The K8S namespace"
@@ -28,7 +28,7 @@ runs:
         echo "Configuring kubectl for context=${{ inputs.K8S_CONTEXT }} namespace=${{ inputs.K8S_NAMESPACE }}"
         rm -f ~/.kube/config
         mkdir -p ~/.kube
-        printf '%s' "$K8S_CONFIG" > ~/.kube/config
+        printf '%s' "$K8S_CONFIG" | base64 -d > ~/.kube/config
         kubectl config set-context ${{ inputs.K8S_CONTEXT }} --cluster=${{ inputs.K8S_CONTEXT }} --namespace=${{ inputs.K8S_NAMESPACE }}
         kubectl config use-context ${{ inputs.K8S_CONTEXT }}
         echo "kubectl configured successfully"