Program shutdown for August 2nd for all machines

m/common/base.nix

@@ -3,6 +3,7 @@
   # Includes the basic configuration for an Intel server.
   imports = [
     ./base/agenix.nix
+    ./base/august-shutdown.nix
     ./base/boot.nix
     ./base/env.nix
     ./base/fs.nix

m/common/base/august-shutdown.nix

@@ -0,0 +1,13 @@
+{
+  # Shutdown all machines on August 2nd at 11:00 AM, so we can protect the
+  # hardware from spurious electrical peaks on the yearly electrical cut for
+  # manteinance that starts on August 4th.
+  systemd.timers.august-shutdown = {
+    description = "Shutdown on August 2nd for maintenance";
+    wantedBy = [ "timers.target" ];
+    timerConfig = {
+      OnCalendar = "*-08-02 11:00:00";
+      Unit = "systemd-poweroff.service";
+    };
+  };
+}