Re-order SSH key types to make ed25519 default

- Fixes: #981

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

overlays/debug/internal/debug_test.go

@@ -109,11 +109,11 @@ data from other structures.
 
 ### SSH
 - Key types:
+  - ed25519
+  - ecdsa
   - rsa
   - dsa
-  - ecdsa
-  - ed25519
-- First key type: rsa
+- First key type: ed25519
 
 ## Node
 

overlays/host/internal/host_test.go

@@ -313,7 +313,7 @@ Filename: etc/profile.d/ssh_setup.csh
 if ( ( $_UID > 500 || $_UID == 0 ) && ( ! -f "$HOME/.ssh/config" && ! -f "$HOME/.ssh/cluster" ) ) then
     echo "Configuring SSH for cluster access"
     install -d -m 700 $HOME/.ssh
-    ssh-keygen -t rsa -f $HOME/.ssh/cluster -N '' -C "Warewulf Cluster key" >& /dev/null
+    ssh-keygen -t ed25519 -f $HOME/.ssh/cluster -N '' -C "Warewulf Cluster key" >& /dev/null
     cat $HOME/.ssh/cluster.pub >>! $HOME/.ssh/authorized_keys
     chmod 0600 $HOME/.ssh/authorized_keys
 
@@ -347,7 +347,7 @@ Filename: etc/profile.d/ssh_setup.sh
 if [ $_UID -ge 500 -o $_UID -eq 0 ] && [ ! -f "$HOME/.ssh/config" -a ! -f "$HOME/.ssh/cluster" ]; then
     echo "Configuring SSH for cluster access"
     install -d -m 700 $HOME/.ssh
-    ssh-keygen -t rsa -f $HOME/.ssh/cluster -N '' -C "Warewulf Cluster key" > /dev/null 2>&1
+    ssh-keygen -t ed25519 -f $HOME/.ssh/cluster -N '' -C "Warewulf Cluster key" > /dev/null 2>&1
     cat $HOME/.ssh/cluster.pub >> $HOME/.ssh/authorized_keys
     chmod 0600 $HOME/.ssh/authorized_keys