chore: fix license handling

License is already base64 encoded, we need to use a different method for
creating the secret.

Signed-off-by: Piotr Zaniewski <[email protected]>

vcluster/deploy/topologies/air-gapped.mdx

@@ -273,16 +273,30 @@ License Setup
 
 Create a Kubernetes `Secret` from the License Key provided by Loft in the `Namespace` where you are installing the air-gapped vCluster instance:
 
+:::tip
+License secret is already `base64` encoded.
+:::
+
 ```bash title="Create Kubernetes Secret"
-# Create license key file
-cat <<EOF > vcluster-pro-air-gapped-license.txt
-YOUR_LICENSE_KEY_HERE
-EOF
+#!/bin/bash
 
-# Create namespace and secret
+# Set the license key as an environment variable (already base64 encoded)
+export VCLUSTER_LICENSE_KEY="YOUR_BASE64_ENCODED_LICENSE_KEY_HERE"
+
+# Optionally create the namespace
 kubectl create namespace vcluster-ns
-kubectl create secret generic vcluster-platform-api-key -n vcluster-ns \
-    --from-file=license-key=./vcluster-pro-air-gapped-license.txt
+
+# Create secret
+kubectl create -f - <<EOF
+apiVersion: v1
+kind: Secret
+metadata:
+  name: vcluster-platform-api-key
+  namespace: vcluster-ns
+type: Opaque
+data:
+  license-key: ${VCLUSTER_LICENSE_KEY}
+EOF
 ```
   </Step>
 
@@ -329,7 +343,6 @@ helm upgrade --install "${VCLUSTER_PRO_NAME}" vcluster-${VERSION}.tgz \
   --version ${VERSION} \
   --values vcluster.yaml \
   --namespace ${VCLUSTER_PRO_NAMESPACE} \
-  --create-namespace
 ```
 
 </Step>