Revert "nixops: switch to grub"

Tickles UEFI bugs in EFI motherboards

This reverts commit 4a758ec029.

nixops/chiron-hardware-configuration.nix

@@ -25,8 +25,6 @@
   nix.maxJobs = lib.mkDefault 16;
   powerManagement.cpuFreqGovernor = lib.mkDefault "powersave";
 
-  boot.loader.grub.enable = true;
-  boot.loader.grub.device = "nodev";
-  boot.loader.grub.efiSupport = true;
+  boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;
 }

nixops/hera-hardware-configuration.nix

@@ -25,8 +25,6 @@
   nix.maxJobs = lib.mkDefault 16;
   powerManagement.cpuFreqGovernor = lib.mkDefault "powersave";
 
-  boot.loader.grub.enable = true;
-  boot.loader.grub.device = "nodev";
-  boot.loader.grub.efiSupport = true;
+  boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;
 }

nixops/hestia-hardware-configuration.nix

@@ -25,8 +25,6 @@
   nix.maxJobs = lib.mkDefault 16;
   powerManagement.cpuFreqGovernor = lib.mkDefault "powersave";
 
-  boot.loader.grub.enable = true;
-  boot.loader.grub.device = "nodev";
-  boot.loader.grub.efiSupport = true;
+  boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;
 }

nixops/juno-hardware-configuration.nix

@@ -25,8 +25,6 @@
   nix.maxJobs = lib.mkDefault 8;
   powerManagement.cpuFreqGovernor = lib.mkDefault "powersave";
 
-  boot.loader.grub.enable = true;
-  boot.loader.grub.device = "nodev";
-  boot.loader.grub.efiSupport = true;
+  boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;
 }

nixops/zeus-hardware-configuration.nix

@@ -25,8 +25,6 @@
   nix.maxJobs = lib.mkDefault 16;
   powerManagement.cpuFreqGovernor = lib.mkDefault "powersave";
 
-  boot.loader.grub.enable = true;
-  boot.loader.grub.device = "nodev";
-  boot.loader.grub.efiSupport = true;
+  boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;
 }