Merge pull request 'doc: Add information about Alpine Linux package to Quick Start' (#564) from jirutka/garage:alpine into next-0.8

Reviewed-on: Deuxfleurs/garage#564

doc/book/quick-start/_index.md

@@ -40,6 +40,25 @@ or if you want a build customized for your system,
 you can [build Garage from source](@/documentation/cookbook/from-source.md).
 
 
+### Alpine Linux
+
+If you use Alpine Linux, you can simply install the
+[garage](https://pkgs.alpinelinux.org/packages?name=garage) package from the
+Alpine Linux repositories (available since v3.17):
+
+```bash
+apk add garage
+```
+
+The default configuration file is installed to `/etc/garage.toml`. You can run
+Garage using: `rc-service garage start`. If you don't specify `rpc_secret`, it
+will be automatically replaced with a random string on the first start.
+
+Please note that this package is built without Consul discovery, Kubernetes
+discovery, OpenTelemetry exporter, and K2V features (K2V will be enabled once
+it's stable).
+
+
 ## Configuring and starting Garage
 
 ### Generating a first configuration file