Add raccoon peer to wireguard

It routes traffic from fox, apex and the compute nodes so that we can
reach the git servers and tent.

Reviewed-by: Aleix Boné <abonerib@bsc.es>

m/common/ssf/hosts-remote.nix

@@ -0,0 +1,9 @@
+{ pkgs, ... }:
+
+{
+  networking.hosts = {
+    # Remote hosts visible from compute nodes
+    "10.106.0.236" = [ "raccoon" ];
+    "10.0.44.4" = [ "tent" ];
+  };
+}