Added Vaultwarden; Not tested

nixos/roles/vaultwarden.nix

@@ -0,0 +1,41 @@
+{ config, pkgs, ... }:
+
+let
+  address = config.systemd.network.networks."10-ethernet".networkConfig.Address;
+  ip = builtins.head (builtins.splitVersion address); # strips the /24
+  port = 8222;
+in
+{
+  services.vaultwarden = {
+    enable = true;
+    environmentFile = config.sops.templates.vaultwarden_env.path;
+    backupDir = "/var/lib/vaultwarden/backup";
+
+    config = {
+      DOMAIN = "http://${ip}:${toString port}";
+      ROCKET_ADDRESS = "0.0.0.0";
+      ROCKET_PORT = port;
+      ROCKET_LOG = "critical";
+      SIGNUPS_ALLOWED = false;
+      WEBSOCKET_ENABLED = true;
+    };
+  };
+
+  networking.firewall.allowedTCPPorts = [ port ];
+
+  systemd.services.vaultwarden-backup-rotate = {
+    description = "Rotate old Vaultwarden backups";
+    serviceConfig = {
+      Type = "oneshot";
+      ExecStart = "${pkgs.findutils}/bin/find /var/lib/vaultwarden/backup -mtime +30 -delete";
+    };
+  };
+
+  systemd.timers.vaultwarden-backup-rotate = {
+    wantedBy = [ "timers.target" ];
+    timerConfig = {
+      OnCalendar = "daily";
+      Persistent = true;
+    };
+  };
+}