Include Updates

Signed-off-by: Cédric Foellmi <cedric@onekiloparsec.dev>

Author: onekiloparsec

docs/local/index.md

@@ -10,6 +10,7 @@ Contact us [team@arcsecond.io](mailto:team@arcsecond.io) to learn more about Arc
 Here is a quick guide to get you started with Arcsecond.local:
 
 1. [Installation](installation.md): Simple steps to install and run Arcsecond locally.
+2. [Updates](updates.md): Learn how to update your Arcsecond.local installation to the latest version.
 2. **Configuration**: Configure Arcsecond.local according to your observatory's needs, including setting up user
    accounts, defining observing sites, and configuring data storage.
 3. **First Observations**: Execute your observations using Arcsecond.local's automated control room, ensuring smooth and

docs/local/updates.md

@@ -0,0 +1,15 @@
+# Updates of Arcsecond.local
+
+::: info
+As of now, the installation of Arcsecond.local requires an individual authentication token, provided manually by
+Arcsecond. In the future, the process will be streamlined and easier.
+:::
+
+Note that your existing installation can still be running, there is no need to stop it before updating. As usual, these
+are commands to be executed in the Arcsecond folder (where the file `docker-compose.yml` file resides).
+
+- Update your Docker images with the latest ones: `docker compose pull`
+- Update your containers (it works for both a running or stopped installation): `docker compose up -d`
+
+Note that it may take some time (1 min or so) for the containers to be recreated. Simply be patient. This is due to
+the various timeout/starting time settings.