Allow clippy::ineffective_open_options lint

It makes little to no sense for a lint to complain about the presence of
the write(true) call on a std::fs::OpenOptions object, just because
append(true) already implies that. Allow the corresponding lint.

src/lib.rs

@@ -1,4 +1,4 @@
-// Copyright (C) 2021-2023 The cargo-http-registry Developers
+// Copyright (C) 2021-2024 The cargo-http-registry Developers
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 //! A crate providing a cargo registry accessible over HTTP.
@@ -9,6 +9,8 @@
 //!
 //! [here]: https://doc.rust-lang.org/cargo/reference/registries.html
 
+#![allow(clippy::ineffective_open_options)]
+
 mod index;
 mod publish;
 mod serve;

tests/end-to-end.rs

@@ -1,6 +1,8 @@
-// Copyright (C) 2021-2023 The cargo-http-registry Developers
+// Copyright (C) 2021-2024 The cargo-http-registry Developers
 // SPDX-License-Identifier: GPL-3.0-or-later
 
+#![allow(clippy::ineffective_open_options)]
+
 use std::fs::create_dir;
 use std::fs::OpenOptions;
 use std::io::Write as _;