staging: add [workspace.lints] to manifest

From Rust 1.74 and onwards, this section enables opt-in lints for crates
of this workspace. Read more information at https://blog.rust-lang.org/2023/11/16/Rust-1.74.0.html

For a crate to opt-in, it needs to set

 [lints]
 workspace = true

In its Cargo.toml

Closes rust-vmm#518

Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>

staging/Cargo.toml

@@ -4,3 +4,29 @@ members = [
   "vhost-device-sound",
   "vhost-device-video",
 ]
+
+[workspace.lints.clippy]
+enum_glob_use = "deny"
+# groups
+correctness = "deny"
+suspicious = "deny"
+complexity = "deny"
+perf = "deny"
+style = "deny"
+nursery = "deny"
+# restriction
+dbg_macro = "deny"
+rc_buffer = "deny"
+as_underscore = "deny"
+assertions_on_result_states = "deny"
+# pedantic
+cast_lossless = "deny"
+cast_possible_wrap = "deny"
+cast_ptr_alignment = "deny"
+naive_bytecount = "deny"
+ptr_as_ptr = "deny"
+bool_to_int_with_if = "deny"
+borrow_as_ptr = "deny"
+case_sensitive_file_extension_comparisons = "deny"
+significant_drop_in_scrutinee = "allow"
+significant_drop_tightening = "allow"

staging/vhost-device-sound/Cargo.toml

@@ -35,3 +35,6 @@ rstest = "0.18.2"
 tempfile = "3.8"
 virtio-queue = { version = "0.10", features = ["test-utils"] }
 vm-memory = { version = "0.13.1", features = ["backend-mmap", "backend-atomic"] }
+
+[lints]
+workspace = true