add work's conf

Signed-off-by: Hadi <hadi@example.com>

hosts/work/persistence.nix

@@ -0,0 +1,28 @@
+# Impermanence: declares what should survive a wipe of "/".
+{
+  environment.persistence."/persist" = {
+    hideMounts = true;
+
+    directories = [
+      "/etc/NetworkManager/system-connections" # Wifi connections, VPN
+      "/var/lib/bluetooth" # Bluetooth connections
+      "/var/lib/nixos" # keeps uid/gid stable across boots
+      "/var/lib/systemd/coredump"
+      "/var/lib/upower" # battery calibration state
+      "/var/lib/systemd/backlight" # remembers screen brightness
+      "/var/lib/systemd/timers" # last-run timestamps (e.g. nix gc weekly)
+      "/var/log"
+      "/var/cache/tuigreet"
+      "/var/db/sudo/lectured" # remembers that the sudo lecture was already shown
+    ];
+
+    files = [
+      "/etc/machine-id"
+      "/etc/ssh/ssh_host_ed25519_key"
+      "/etc/ssh/ssh_host_ed25519_key.pub"
+      "/etc/ssh/ssh_host_rsa_key"
+      "/etc/ssh/ssh_host_rsa_key.pub"
+      "/var/lib/systemd/random-seed" # avoid a weak entropy pool on first boot
+    ];
+  };
+}