nixos/actual: add environmentFile option

nixos/modules/services/web-apps/actual.nix

@@ -32,6 +32,16 @@ in
       description = "Whether to open the firewall for the specified port.";
     };
 
+    environmentFile = mkOption {
+      type = types.nullOr types.path;
+      default = null;
+      description = ''
+        Environment file for specifying additional settings such as secrets.
+
+        See <https://actualbudget.org/docs/config/oauth-auth#environment-variables>.
+      '';
+    };
+
     settings = mkOption {
       default = { };
       description = "Server settings, refer to [the documentation](https://actualbudget.org/docs/config/) for available options.";
@@ -76,6 +86,7 @@ in
         Group = "actual";
         StateDirectory = "actual";
         WorkingDirectory = dataDir;
+        EnvironmentFile = cfg.environmentFile;
         LimitNOFILE = "1048576";
         PrivateTmp = true;
         PrivateDevices = true;