[router] enable sccache in ci and local build (#10099)

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

@@ -15,6 +15,10 @@ concurrency:
   group: pr-test-rust-${{ github.ref }}
   cancel-in-progress: true
 
+env:
+  RUSTC_WRAPPER: sccache
+  SCCACHE_GHA_ENABLED: "true"
+
 jobs:
   unit-test-rust:
     if: github.repository == 'sgl-project/sglang' || github.event_name == 'pull_request'
@@ -27,10 +31,17 @@ jobs:
         run: |
           bash scripts/ci/ci_install_rust.sh
 
+      - name: Configure sccache
+        uses: mozilla-actions/sccache-action@v0.0.9
+        with:
+          version: "v0.10.0"
+
       - name: Rust cache
         uses: Swatinem/rust-cache@v2
         with:
           workspaces: sgl-router
+          cache-all-crates: true
+          cache-on-failure: true
 
       - name: Run lint
         run: |
@@ -65,6 +76,11 @@ jobs:
           # Run quick benchmarks to ensure they work using Python script
           python3 scripts/run_benchmarks.py --quick
 
+      - name: Show sccache stats
+        if: always()
+        run: sccache --show-stats
+
+  e2e-python:
   pytest-rust:
     if: github.repository == 'sgl-project/sglang' || github.event_name == 'pull_request'
     runs-on: BM.A10.4
@@ -77,6 +93,18 @@ jobs:
         run: |
           bash scripts/ci/ci_install_rust.sh
 
+      - name: Configure sccache
+        uses: mozilla-actions/sccache-action@v0.0.9
+        with:
+          version: "v0.10.0"
+
+      - name: Rust cache
+        uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: sgl-router
+          cache-all-crates: true
+          cache-on-failure: true
+
       - name: Install SGLang dependencies
         run: |
           sudo bash scripts/ci/ci_install_dependency.sh
@@ -84,6 +112,7 @@ jobs:
       - name: Build python binding
         run: |
           source "$HOME/.cargo/env"
+          export RUSTC_WRAPPER=sccache
           cd sgl-router
           pip install setuptools-rust wheel build
           python3 -m build