feat: update droppie shutdown, default to UTC

hosts/droppie/backup-autostop.nix

@@ -1,10 +1,10 @@
 {pkgs, ...}: let
   shutdownWaitMinutes = 10;
   shutdownScript = pkgs.writeShellScriptBin "shutdown-wait" ''
+    ssh_login_active="$(ps aux | grep "sshd: yule" | grep -v grep)"
 
-
-    if [ -n "''${running}" ] && [ "''${running}" = "yes" ]; then
-      echo "backups are still running"
+    if [ -n "''${ssh_login_active}" ] && [ "''${ssh_login_active}" != "0" ]; then
+      echo "There is still an active ssh connection"
       exit 1
     fi
 
@@ -26,7 +26,7 @@ in {
   systemd.timers."shutdown-after-backup" = {
     enable = true;
     timerConfig = {
-      OnCalendar = "*-*-* 02..09:00,15,30,45:00 Etc/UTC";
+      OnCalendar = "*-*-* 02..09:05,20,35,50:00 Etc/UTC";
     };
     wantedBy = ["timers.target"];
     partOf = ["shutdown-after-backup.service"];

modules/core/i18n.nix

@@ -7,7 +7,7 @@
 with lib; {
   config = {
     # Set your time zone.
-    time.timeZone = "Europe/Berlin";
+    time.timeZone = "Etc/UTC";
 
     # Select internationalisation properties.
     console = {

users/b12f/default.nix

@@ -19,6 +19,9 @@ in {
       owner = psCfg.user.name;
     };
 
+    # Set your time zone.
+    time.timeZone = "Europe/Berlin";
+
     pub-solar = {
       user = {
         name = "b12f";