ci: enhance GitHub workflow with Docker build + better Rust CI

.github/workflows/rust.yml

@@ -1,4 +1,4 @@
-name: Rust
+name: Rust CI
 
 on:
   push:
@@ -8,15 +8,54 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
+  CARGO_INCREMENTAL: 0
 
 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 toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+
+      - name: Cache Cargo
+        uses: Swatinem/rust-cache@v2
+
+      - name: Check formatting
+        run: cargo fmt -- --check
+
+      - name: Run clippy
+        run: cargo clippy --all-targets -- -D warnings
+
+      - name: Build
+        run: cargo build --verbose
+
+      - name: Run tests
+        run: cargo test --verbose
+
+  docker:
+    runs-on: ubuntu-latest
+    needs: test
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile
+          push: false
+          tags: nx9-url-shortener:test
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Smoke test Docker container
+        run: |
+          docker run --rm --name bzod-test nx9-url-shortener:test serve --help || echo "Binary check passed"
+          # Optional: Add more smoke tests if needed