server: add forgjo initial configuration

modules/nixos/server/services/default.nix

@@ -1,5 +1,6 @@
 {
   imports = [
     ./website
+    ./forgejo
   ];
 }

modules/nixos/server/services/forgejo/default.nix

@@ -0,0 +1,33 @@
+{
+  config,
+  lib,
+  ...
+}: let
+  inherit (config.ooknet.server) services domain;
+  inherit (lib) mkIf elem;
+in {
+  config = mkIf (elem "forgejo" services) {
+    ooknet.server = {
+      webserver.caddy.enable = true;
+      database.postgresql.enable = true;
+    };
+    services = {
+      forgejo = {
+        enable = true;
+
+        settings = {
+          server = {
+            DOMAIN = "git.${domain}";
+            ROOT_URL = "https://git.${domain}";
+            HTTP_PORT = 3000;
+          };
+        };
+      };
+      caddy.virtualHosts = {
+        "git.${domain}".extraConfig = ''
+          reverse_proxy 127.0.0.1:3000
+        '';
+      };
+    };
+  };
+}