Add documentation for Valkey

docs/hypernode-platform/tools/how-to-use-valkey-on-hypernode.md

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+# How to use Valkey on your Hypernode
+
+This article explains how to use Valkey on our Hypernode platform.
+
+## What is Valkey?
+
+Valkey is a Redis-compatible in-memory store. On Hypernode, **Valkey-8** is available on Debian Bookworm single-node setups.
+Since Valkey is a drop-in replacement for Redis, it can be used in the same applications as Redis.
+
+## Changing from Redis to Valkey
+
+Your Hypernode is configured with Redis by default.
+Changing from Redis to Valkey is pretty easy on Hypernode. You can use the `hypernode-systemctl` command-line tool to change from Redis to Valkey.
+
+```console
+app@abcdef-appname-magweb-cmbl:~$ hypernode-systemctl settings valkey_enabled true
+Operation was successful and is being processed. Please allow a few minutes for the settings to be applied. Run 'livelog' to see the progress.
+```
+
+It may take a few minutes for the changes to be applied. You can monitor the progress by running `hypernode-log`.
+Once the process is complete, Valkey will be enabled and Redis will be disabled on your Hypernode.
+
+## Using Valkey tools
+
+Redis comes by default with a bunch of useful tools pre-installed on Hypernode, like `redis-cli` and `redis-benchmark`.
+Once you have switched to Valkey, you can use the `valkey-cli` and `valkey-benchmark` tools instead.
+However, to make it even more easy, we made sure that the `redis-cli` and `redis-benchmark` commands are symlinked to their Valkey counterparts when Valkey is enabled.
+In this way you can keep using the same commands you are used to.
+
+## How to configure Valkey in Magento 2
+
+The configuration for Valkey is the same as for Redis.
+You can follow our [Magento 2 Redis configuration guide](../../ecommerce-applications/magento-2/how-to-configure-redis-for-magento-2.md) to configure Valkey for Magento 2.