Refactor Rust CI workflow to include testing steps

Author: WendellXY

.github/workflows/rust.yml

@@ -12,13 +12,34 @@ env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  build:
-
+  test:
     runs-on: ubuntu-latest
-
     steps:
-    - uses: actions/checkout@v4
-    - name: Build
-      run: cargo build --verbose
-    - name: Run tests
-      run: cargo test --verbose
+      - uses: actions/checkout@v4
+
+      - name: Install Rust (stable)
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: stable
+
+      - name: Cache Rust builds
+        uses: Swatinem/rust-cache@v2
+
+      - name: Install cargo-binstall
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-binstall
+
+      - name: Install langcodec-cli (prebuilt if available)
+        run: cargo binstall -y langcodec-cli
+
+      - name: Verify CLI
+        run: |
+          echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+          langcodec-cli --version
+
+      - name: Build
+        run: cargo build --verbose
+
+      - name: Test
+        run: cargo test --verbose