modules/security: add hlissner-based security config

modules/modules/boot.nix

@@ -45,8 +45,10 @@ in
       boot.loader = {
         systemd-boot = {
           enable = mkDefault true;
-          editor = false;
           consoleMode = "2";
+
+          # See desc in nixpkgs/nixos/modules/system/boot/loader/systemd-boot/systemd-boot.nix
+          editor = false;
         };
 
         efi.canTouchEfiVariables = true;

modules/modules/security.nix

@@ -0,0 +1,13 @@
+{ config, lib, ... }:
+with lib;
+with lib.hlissner;
+{
+  # Security settings based on https://github.com/hlissner/dotfiles/blob/master/modules/security.nix
+  security.acme.acceptTerms = true;
+
+  boot = {
+    # Make tmp volatile, using tmpfs is speedy on SSD systems
+    tmpOnTmpfs = mkDefault true;
+    cleanTmpDir = mkDefault (!config.boot.tmpOnTmpfs);
+  };
+}