Re-enable sccache (#9670)

.github/workflows/ci.yml

@@ -47,6 +47,7 @@ jobs:
       CARGO_INCREMENTAL: 0
       RUST_BACKTRACE: full
       CARGO_TERM_COLOR: always
+      RUSTC_WRAPPER: sccache
 
     steps:
       - name: Configure git
@@ -71,11 +72,39 @@ jobs:
           mkdir -p target/release
           tar --exclude=.cargo_home --exclude=".git*" --exclude=target --exclude=third_party/prebuilt -czvf target/release/deno_src.tar.gz -C .. deno
 
+      # Note the following caches target which includes sccache.
+      - uses: Swatinem/rust-cache@v1
+
       - name: Install rust
         uses: hecrj/setup-rust-action@v1
         with:
           rust-version: 1.50.0
 
+      - name: Install and start sccache
+        shell: pwsh
+        env:
+          SCCACHE_DIR: ${{ github.workspace }}/target/sccache
+          SCCACHE_CACHE_SIZE: 128M
+          SCCACHE_IDLE_TIMEOUT: 0
+        run: |
+          $version = "v0.2.15"
+          $platform =
+            @{ "macOS"   = "x86_64-apple-darwin"
+               "Linux"   = "x86_64-unknown-linux-musl"
+               "Windows" = "x86_64-pc-windows-msvc"
+             }.${{ runner.os }}
+          $basename = "sccache-$version-$platform"
+          chmod u+x $basename/sccache
+          $url = "https://github.com/mozilla/sccache/releases/download/" +
+                 "$version/$basename.tar.gz"
+          cd ~
+          curl -LO $url
+          tar -xzvf "$basename.tar.gz"
+          chmod u+x $basename/sccache
+          . $basename/sccache --start-server
+          echo "$(pwd)/$basename" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+
+
       - name: Install clippy and rustfmt
         if: matrix.kind == 'lint'
         run: |
@@ -330,3 +359,7 @@ jobs:
             target/release/deno_src.tar.gz
             target/release/lib.deno.d.ts
           draft: true
+
+      - name: Stop sccache
+        if: always()
+        run: sccache --stop-server