modularize cinny and ente-auth, add package ente-auth-web

The previous was more of a workaround not fitting in the spirit of
nixos, this fixes this and makes proper modules out of them. Sadly
ente-web-auth has to be build with a env var and therefore can't be
configured before properly.

modules/nixos/services/ente-auth/default.nix

@@ -0,0 +1,47 @@
+{
+  lib,
+  pkgs,
+  config,
+  namespace,
+  ...
+}:
+with lib;
+with lib.${namespace};
+let
+  cfg = config.${namespace}.services.ente-auth;
+in
+{
+  options.${namespace}.services.ente-auth = {
+    enable = mkEnableOption "Ente-Auth";
+
+    package = mkOption {
+      description = "The package of Ente-Auth to use.";
+      type = types.package;
+      default = pkgs.awesome-flake.ente-web-auth;
+    };
+
+    port = mkOption {
+      description = "The port to serve Ente-Auth on.";
+      type = types.nullOr types.int;
+      default = 1338;
+    };
+  };
+
+  config = mkIf cfg.enable {
+    networking.firewall.allowedTCPPorts = [
+      cfg.port
+    ];
+
+    services.caddy = {
+      enable = true;
+      virtualHosts = {
+        ":${builtins.toString cfg.port}" = {
+          extraConfig = ''
+            root * ${cfg.package}
+            file_server
+          '';
+        };
+      };
+    };
+  };
+}