chore: improve clippy CI

.forgejo/workflows/clippy-check.yml

@@ -25,4 +25,4 @@ jobs:
 
       - name: Run Clippy
         run: |
-          nix develop . --command cargo clippy -- -Dwarnings
+          nix build .#clippy --print-build-logs -j auto

.forgejo/workflows/nightly-release.yml

@@ -22,6 +22,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Build firmware image
         run: |
+          nix build .#clippy -o clippy
           nix build .# -o dist --print-build-logs
       - name: (Re-)generate tag
         run: |

flake.nix

@@ -54,18 +54,26 @@
         ${pkgs.elf2uf2-rs}/bin/elf2uf2-rs ${self.packages.${system}.naxgcc-fw}/bin/${self.packages.${system}.naxgcc-fw.pname} $out/bin/${self.packages.${system}.naxgcc-fw.pname}.uf2
       '';
 
-      packages.naxgcc-fw = naersk_lib.buildPackage {
-        pname = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package.name;
-        version = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package.version;
+      packages.naxgcc-fw = pkgs.callPackage
+        ({ mode ? "build" }: naersk_lib.buildPackage {
+          pname = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package.name;
+          version = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package.version;
 
-        src = self;
+          inherit mode;
 
-        cargoBuildOptions = _orig: _orig ++ [
-          "--target=${CARGO_BUILD_TARGET}"
-        ];
+          src = self;
 
-        # if a tree falls in the forest and no one is around to hear it, does it make a sound?
-        DEFMT_LOG = "off";
+          cargoBuildOptions = _orig: _orig ++ [
+            "--target=${CARGO_BUILD_TARGET}"
+          ];
+
+          # if a tree falls in the forest and no one is around to hear it, does it make a sound?
+          DEFMT_LOG = "off";
+        })
+        { };
+
+      packages.clippy = self.packages.${system}.naxgcc-fw.override {
+        mode = "clippy";
       };
 
       devShells.default = pkgs.mkShell {

src/usb_comms.rs

@@ -130,6 +130,9 @@ impl MyDeviceHandler {
 impl Handler for MyDeviceHandler {
     fn enabled(&mut self, enabled: bool) {
         self.configured = true;
+
+        // reason: in production, info! compiles to nothing
+        #[allow(clippy::if_same_then_else)]
         if enabled {
             info!("Device enabled");
         } else {