[router] add rust cache for rust unit test (#10079)

.github/workflows/pr-test-rust.yml

@@ -27,6 +27,11 @@ jobs:
         run: |
           bash scripts/ci/ci_install_rust.sh
 
+      - name: Rust cache
+        uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: sgl-router
+
       - name: Run lint
         run: |
           source "$HOME/.cargo/env"

sgl-router/README.md

@@ -377,6 +377,7 @@ Set `rust-analyzer.linkedProjects` to the absolute path of `Cargo.toml`:
 The continuous integration pipeline includes comprehensive testing, benchmarking, and publishing:
 
 #### Build & Test
+
 1. **Build Wheels**: Uses `cibuildwheel` for manylinux x86_64 packages
 2. **Build Source Distribution**: Creates source distribution for pip fallback
 3. **Rust HTTP Server Benchmarking**: Performance testing of router overhead