Documentation for SSH key type configuration

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

overlays/debug/rootfs/warewulf/template-variables.md.ww

@@ -108,6 +108,15 @@ data from other structures.
   - Mount: {{ $export.Mount }}
 {{- end }}
 
+### SSH
+
+{{- if gt (len .Ssh.KeyTypes) 0 }}
+- Key types:
+{{- range $index, $keyType :=  .Ssh.KeyTypes }}
+  - {{ $keyType }}
+{{- end }}
+- First key type: {{ index .Ssh.KeyTypes 0 }}
+{{- end }}
 
 ### Warewulf
 

userdocs/contents/configuration.rst

@@ -49,6 +49,12 @@ Warewulf (4.5.1):
      - source: /etc/resolv.conf
        dest: /etc/resolv.conf
        readonly: true
+   ssh:
+     key types:
+       - rsa
+       - dsa
+       - ecdsa
+       - ed25519
 
 Generally you can leave this file as is, as long as you set the
 appropriate networking information. Specifically the following
@@ -151,6 +157,25 @@ may be overridden using ``warewulf.conf:paths``.
 
 * ``wwclientdir``: Where the Warewulf client looks for its configuration on a provisioned node.
 
+SSH key types
+-------------
+
+*New in Warewulf v4.5.1*
+
+SSH key types to generate during ``wwctl configure ssh`` may be overridden using ``warewulf.conf:ssh:key types``.
+
+.. code-block:: yaml
+
+   ssh:
+     key types:
+       - rsa
+       - dsa
+       - ecdsa
+       - ed25519
+
+Warewulf will generate host keys for each listed key type.
+The first listed key type is used to generate authentication ssh keys.
+
 nodes.conf
 ==========