NixOS AMI: Give grub a 1s timeout now that AWS has emergency console access.

See:

* https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/enhanced-networking-os.html
* https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/grub.html

Changed files
+1 -1
nixos
modules
virtualisation
+1 -1
nixos/modules/virtualisation/amazon-image.nix
···
boot.loader.grub.extraPerEntryConfig = mkIf (!cfg.hvm) "root (hd0)";
boot.loader.grub.efiSupport = cfg.efi;
boot.loader.grub.efiInstallAsRemovable = cfg.efi;
-
boot.loader.timeout = 0;
+
boot.loader.timeout = 1;
boot.initrd.network.enable = true;