Add log-to-ram module

modules/log-to-ram/default.nix

@@ -0,0 +1,10 @@
+{ pkgs, ... }:
+{
+  fileSystems."/tmp/log " = {
+    fsType = "tmpfs";
+    options = [ "size=512M" ];
+  };
+  services.journald.extraConfig = ''
+    SystemMaxUse=300M
+  '';
+}

systems/raspi4/default.nix

@@ -2,6 +2,7 @@
 {
   imports = [
     inputs.nixos-hardware.nixosModules.raspberry-pi-4
+    "${inputs.self}/modules/log-to-ram"
     "${inputs.self}/modules/ntp"
     "${inputs.self}/modules/syslog"
   ];