add codeberg-themes to forgejo

packages/codeberg-themes/default.nix

@@ -0,0 +1,40 @@
+{
+  lib,
+  stdenv,
+  fetchFromGitea,
+}:
+
+stdenv.mkDerivation rec {
+  pname = "codeberg-themes";
+  version = "1.0";
+  src = fetchFromGitea {
+    domain = "codeberg.org";
+    owner = "Codeberg-Infrastructure";
+    repo = "forgejo";
+    rev = "codeberg-11";
+    sha256 = "sha256-iPPj7Hz+Jp+lnAa0N5rjSIXWYiTvjPQ8pMQB3SetdYA=";
+  };
+
+  unpackPhase = ''
+    # We clone the repo and only extract the folder we need
+    mkdir -p $out
+    cp -r $src/web_src/css/themes $out/themes
+  '';
+
+  installPhase = ''
+    # Create the required directories for installation
+    mkdir -p $out/var/lib/forgejo/custom/public/assets/css
+    mkdir -p $out/var/lib/forgejo/custom/public/assets/img
+
+    # Move theme files
+    cp -r $out/themes/* $out/var/lib/forgejo/custom/public/assets/css/
+
+    # Install logo
+    cp ${./logo.svg} $out/var/lib/forgejo/custom/public/assets/img/
+  '';
+
+  meta = with lib; {
+    description = "Codeberg themes and logo for Forgejo";
+    maintainers = with maintainers; [ spaenny ];
+  };
+}