ci: cache valgrind

.github/workflows/benchmark.yml

@@ -13,6 +13,9 @@ permissions:
   # contents permission to update benchmark contents in gh-pages branch
   contents: write
 
+env:
+  VALGRIND_VERSION: '1:3.18.1-1ubuntu2'
+
 jobs:
   benchmark:
     runs-on: ubuntu-latest
@@ -32,8 +35,24 @@ jobs:
       - name: pnpm run build
         run: pnpm run build
 
+      - name: Cache valgrind
+        uses: actions/cache@v3
+        id: cache-valgrind
+        with:
+          path: '~/valgrind'
+          key: ${{ runner.os }}-$VALGRIND_VERSION
+
       - name: Install valgrind
-        run: sudo apt install -y valgrind
+        env:
+          CACHE_HIT: ${{steps.cache-valgrind.outputs.cache-hit}}
+        run: |
+          if [[ "$CACHE_HIT" == 'true' ]]; then
+            sudo cp --verbose --force --recursive ~/valgrind/* /
+          else
+            sudo apt-get install --yes valgrind="$VALGRIND_VERSION"
+            mkdir -p ~/valgrind
+            sudo dpkg -L valgrind | while IFS= read -r f; do if test -f $f; then echo $f; fi; done | xargs cp --parents --target-directory ~/valgrind/
+          fi
 
       - name: Setup cachegrind-benchmarking
         run: node benchmark/setup-cachegrind-benchmarking.js