Add forge server, clean up common nginx configuration, and update for

latest nixos configuration expectations

nix/home/programs/forgejo/backendserver.nix

@@ -0,0 +1,29 @@
+{lib, ...}:
+
+let
+ domain = lib.strings.fileContents ../../../../secrets/letsencrypt/mediaserver/forgedomain;
+ port = 9090;
+in
+{
+  networking.firewall = {
+    allowedTCPPorts = [ port ];
+    allowedUDPPorts = [ port ];
+  };
+
+  services.forgejo = {
+    enable = true;
+    # database.type = "postgres";
+    # Enable support for Git Large File Storage
+    lfs.enable = true;
+    settings = {
+      server = {
+        DOMAIN = domain;
+        # You need to specify this to remove the port from URLs in the web UI.
+        ROOT_URL = "https://${domain}/";
+        HTTP_PORT = port;
+      };
+      # You can temporarily allow registration to create an admin user.
+      service.DISABLE_REGISTRATION = true;
+    };
+  };
+}