ryzensun: use tee in initrd postCommand script

https://github.com/NixOS/nixpkgs/issues/63941#issuecomment-2081126437

hosts/ryzensun/ryzensun.nix

@@ -29,11 +29,12 @@ in {
     boot.binfmt.emulatedSystems = ["aarch64-linux"];
 
     # Required for WakeOnLan
-    boot.kernelParams = [ "ip=dhcp" ];
     boot.initrd = {
       availableKernelModules = [ "r8169" ];
       network = {
         enable = true;
+        udhcpc.enable = true;
+        flushBeforeStage2 = true;
         ssh = {
           enable = true;
           # To prevent ssh clients from freaking out because a different host key is used,
@@ -47,7 +48,8 @@ in {
         };
         postCommands = ''
           # Automatically ask for the password on SSH login
-          echo 'cryptsetup-askpass || echo "Unlock was successful; exiting SSH session" && exit 1' >> /root/.profile
+          echo 'cryptsetup-askpass || echo "Unlock was successful; exiting SSH session" && exit 1' \
+            | tee /root/.profile
         '';
       };
     };