backwards: Add calibre-web module

hosts/backwards/modules/calibre-web/default.nix

@@ -0,0 +1,32 @@
+{ lib, config, ... }:
+let
+  enabled = config.mod.calibre-web.enable;
+in
+{
+  options = {
+    mod.calibre-web = {
+      enable = lib.mkEnableOption "add calibre-web module";
+    };
+  };
+
+  config = lib.mkIf enabled {
+    services = {
+      calibre-web = {
+        enable = true;
+
+        user = "alex";
+        group = "users";
+
+        listen = {
+          ip = "0.0.0.0";
+          port = 8083;
+        };
+
+        options = {
+          calibreLibrary = "/home/alex/sync/books";
+          enableBookUploading = true;
+        };
+      };
+    };
+  };
+}