trim down install, tighten sshd

install.sh

@@ -43,7 +43,7 @@ fi
 # Update or clone the CoreDesktop repo
 echo "Getting the latest version of CoreDesktop..."
 if [ -d "$HOME/.local/share/coredesktop/.git" ]; then
-  git -C ~/.local/share/coredesktop pull
+  git -C ~/.local/share/coredesktop pull --ff-only
 else
   git clone https://gitea.federated.computer/Federated_Computer/coredesktop.git ~/.local/share/coredesktop
 fi
@@ -189,6 +189,10 @@ fi
 echo "Applying system defaults..."
 bash ~/.local/share/coredesktop/system/defaults.sh
 
+# SSH logins with keys only, not passwords
+echo "Configuring the SSH server..."
+bash ~/.local/share/coredesktop/system/sshd.sh
+
 # Block incoming connections except SSH, mDNS, LocalSend and Tailscale
 echo "Configuring the firewall..."
 bash ~/.local/share/coredesktop/system/firewall.sh