docs(ins): update docs rhel

Author: bene2k1

pages/instances/reference-content/use-red-hat-license.mdx

@@ -23,7 +23,6 @@ This guide explains how to deploy a RHEL Instance and attach your existing Red H
 
 ## Deploying a RHEL Instance
 
-
 1. Click **CPU & GPU Instances** in the **Compute** section of the side menu. The [Instance dashboard](https://console.scaleway.com/instance/servers) displays.
 2. Click **Create Instance**. The [Instance creation page](https://console.scaleway.com/instance/servers) displays.
 3. Configure the Instance:
@@ -55,47 +54,83 @@ Once created, connect to your Instance over SSH:
   ```
   Replace `<your_instance_ip>` with the actual public IP address of your Instance.
 
-
-
 ## Registering your Instance with Red Hat
 
-After logging in, you must register the Instance to enable repositories and updates.
-
-### Option A — Register with username/password
-
-Run the following command to register your Instance using your Red Hat username and password:
-  ```bash
-  sudo subscription-manager register
-  ```
-  Enter your Red Hat Customer Portal credentials when prompted.
-
-### Option B — Register with activation key
-
-If you have an activation key to register your Instance, run the following command
-  ```bash
-  sudo subscription-manager register \
-    --org=<RED_HAT_ORGANIZATION_ID> \
-    --activationkey=<RED_HAT_KEY>
-  ```
-  Replace `RED_HAT_ORGANIZATION_ID` with your Red Hat organization ID and `RED_HAT_KEY` with your secret key issued by Red Hat.
-
-## Attach a subscription
-
-If your subscription is not automatically assigned, attach one manually:
-  ```bash
-  sudo subscription-manager attach --auto
-  ```
-
-Alternatively, you can list available subscriptions:
-  ```bash
-  sudo subscription-manager list --available
-  ```
-
-Chose a license and attach one:
-  ```bash
-  sudo subscription-manager attach --pool=<RED_HAT_POOL_ID>
-  ```
-  Replace `RED_HAT_POOL_ID` with the ID of the license pool you want to activate.
+<Tabs>
+  <TabsTab label="Using SSH">
+    After logging in, you must register the Instance to enable repositories and updates. The steps below describe how to regiser your Instance manually from the terminal. Alternatively you can register it automatically during deployment using [cloud-init](?tab=using-cloud-init-0).
+
+    ### Option A — Register with username/password
+
+    Run the following command to register your Instance using your Red Hat username and password:
+      ```bash
+      sudo subscription-manager register
+      ```
+      Enter your Red Hat Customer Portal credentials when prompted.
+
+    ### Option B — Register with activation key
+
+    If you have an activation key to register your Instance, run the following command
+      ```bash
+      sudo subscription-manager register \
+        --org=<RED_HAT_ORGANIZATION_ID> \
+        --activationkey=<RED_HAT_KEY>
+      ```
+      Replace `RED_HAT_ORGANIZATION_ID` with your Red Hat organization ID and `RED_HAT_KEY` with your secret key issued by Red Hat.
+
+    ## Attach a subscription
+
+    If your subscription is not automatically assigned, attach one manually:
+      ```bash
+      sudo subscription-manager attach --auto
+      ```
+
+    Alternatively, you can list available subscriptions:
+      ```bash
+      sudo subscription-manager list --available
+      ```
+
+    Chose a license and attach one:
+      ```bash
+      sudo subscription-manager attach --pool=<RED_HAT_POOL_ID>
+      ```
+      Replace `RED_HAT_POOL_ID` with the ID of the license pool you want to activate.
+  </TabsTab>
+  <TabsTab label="Using cloud-init">
+    Cloud-init may be used to automatically register your Instance during creation. To use this feature, simply add the following cloud-init configuration script to the `Cloud-Init` section of the `Settings` tab in the console:
+
+    ### Option A — Register with username/password
+
+    Using your Red Hat username and password, use the following cloud-init configuration script:
+
+      ```bash
+      #cloud-config
+      rh_subscription:
+        username: [email protected]
+        password: "youRedHatPassword"
+      ```
+
+    ### Option B — Register with activation key
+
+    If you have an activation key to register your Instance, use the following cloud-init configuration script:
+
+      ```bash
+      #cloud-config
+      rh_subscription:
+        activation-key: RED_HAT_KEY
+        org: "RED_HAT_ORGANIZATION_ID"
+      ```
+      Replace `RED_HAT_ORGANIZATION_ID` with your Red Hat organization ID and `RED_HAT_KEY` with your secret key issued by Red Hat.
+
+    <Message type="important">
+      Make sure to respect hyphen and quote usage in the cloud-init config scripts otherwise the subscription may silently fail.
+    If the `cloud-init` subscription fails, the following line should appear in the `/var/log/cloud-init.log` file :
+    ```
+    rh_subscription: module not configured.
+    ```
+    </Message>
+  </TabsTab>
+</Tabs>
 
 ## Confirm registration