move in some install docs from downstream (#246)

cli/gateway.adoc

@@ -78,6 +78,16 @@ The URL field shows the underlying communication and can be ignored.
 
 This section shows more advanced usage of skupper gateway.
 
+. If you want to create a service type gateway on Linux, you need the `skrouterd` binary in your path.
++
+Use the `yum` or `dnf` command to install the `skupper-router` package:
++
+----
+$ sudo dnf install skupper-router
+----
++
+For podman or docker type gateways, you can skip this step.
+
 . Create a Skupper gateway:
 +
 --
@@ -173,6 +183,7 @@ where
 
 // Type: procedure
 [id="exporting-gateway"] 
+
 === Creating a gateway and applying it on a different machine
 
 If you have access to a cluster from one machine but want to create a gateway to the {service-network} from a different machine, you can create the gateway definition bundle on the first machine and later apply that definition bundle on a second machine as described in this procedure.
@@ -323,6 +334,7 @@ This shows that there is only one exposed service and that service is only expos
 
 NOTE: If you need to change the gateway definition, for example to change port, you need to remove the existing gateway and repeat this procedure from the start to redefine the gateway.
 
+
 // Type: procedure
 [id="gateway-reference"] 
 === Gateway YAML reference

cli/podman.adoc

@@ -64,14 +64,39 @@ See link:{cli-link} for information about using the Skupper CLI to create Podman
 
 * The latest `skupper` CLI is installed.
 * Podman is installed, see https://podman.io/
+
+* `netavark` is configured as the podman network backend.
 +
 --
 By default, Podman v4 uses Netavark which works with Skupper.
+
 If you are using CNI, for example, if you upgrade from Podman v3, you must also install the `podman-plugins` package.
 For example, `dnf install podman-plugins` for RPM based distributions.
 
 NOTE: CNI will be deprecated in the future in preference of Netavark.
+
+To check if `netavark` is configured as the podman network backend:
+
+----
+$ podman info | grep networkBackend
+----
+
+To install `netavark` on rpm based Linux, eg RHEL8:
+
+----
+$ sudo dnf install netavark
+----
+
+Configure podman to use `netavark` by making sure the following lines exist in the `/etc/containers/containers.conf` file:
+
+----
+[network]
+network_backend = "netavark"
+----
+
+
 --
+
 * Podman service endpoint.
 +
 --
@@ -82,6 +107,7 @@ Use `systemctl --user enable --now podman.socket` to start the  Podman API Socke
 See link:https://github.com/containers/podman/blob/main/docs/tutorials/socket_activation.md[Podman socket activation] for information about enabling this endpoint.
 --
 
+.Procedure
 
 . Set your session to use Skupper Podman:
 +