ci: add cargo machete

.github/workflows/rust.yml

@@ -146,3 +146,25 @@ jobs:
 
       - name: Run fmt
         run: cargo fmt --all -- --check
+
+  machete:
+    if: github.event_name == 'push' || github.event_name == 'schedule' ||
+      github.event.pull_request.head.repo.full_name != github.repository
+
+    name: Machete dependencies checks
+    runs-on: ubuntu-latest
+    needs: ["build"]
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: stable
+
+      - name: Cache Cargo registry
+        uses: Swatinem/rust-cache@v2
+
+      - name: Run cargo-machete
+        uses: bnjbvr/[email protected]