Add anisette-v3-server package (SideStore anisette server)

pkgs/anisette-v3-server/default.nix

@@ -0,0 +1,27 @@
+{
+  lib,
+  buildDubPackage,
+  fetchFromGitHub,
+}:
+
+buildDubPackage rec {
+  pname = "anisette-v3-server";
+  version = "unstable-2026-08-01";
+
+  src = fetchFromGitHub {
+    owner = "Dadoum";
+    repo = "anisette-v3-server";
+    rev = "2ef18d7da2abe3a6d070aa478f774538b947aaa2";
+    hash = "sha256-G8loi2BTIRKamLeY8DiN4BLSrRxh13BNvs8bC2l9zNo=";
+  };
+
+  dubLock = ./dub-lock.json;
+
+  meta = {
+    description = "Anisette server implementing SideStore's anisette v3 protocol";
+    homepage = "https://github.com/Dadoum/anisette-v3-server";
+    license = lib.licenses.agpl3Only;
+    mainProgram = "anisette-v3-server";
+    platforms = lib.platforms.linux;
+  };
+}