Use custom Node.js binary in CI

.gitattributes

@@ -8,3 +8,5 @@
 /src/_grapheme_table.js              linguist-generated
 /src/_incb_table.js                  linguist-generated
 /test/_unicode_testdata.js           linguist-generated
+
+/prebuilt/*  linguist-vendored

.github/workflows/ci.yml

@@ -44,8 +44,29 @@ jobs:
       - name: Install Dependencies
         run: yarn install --immutable
 
+      - uses: actions/cache@v4
+        id: cache-prebuilt-node
+        with:
+          key: node-v24.0.0-pre-linux-x64_icu76.1
+          path: prebuilt/node-v24.0.0-pre-linux-x64_icu76.1
+
+      - name: Download Prebuilt Node.js with ICU 76.1
+        if: steps.cache-prebuilt-node.cache-hit != 'true'
+        run: |
+          sudo apt-get update && sudo apt-get upgrade g++
+          ls -al /lib/x86_64-linux-gnu
+          export PREBUILT_BINARY="prebuilt/node-v24.0.0-pre-linux-x64_icu76.1"
+          mkdir -p "$(dirname $PREBUILT_BINARY)"
+          curl -fsSL -o "$PREBUILT_BINARY" \
+            "https://github-actions-assets.cometkim.dev/$PREBUILT_BINARY"
+          chmod +x "$PREBUILT_BINARY"
+          echo "PREBUILT_BINARY=$PREBUILT_BINARY" >> $GITHUB_ENV
+
       - name: Execute Tests
-        run: yarn test:coverage
+        run: |
+          $PREBUILT_BINARY \
+            --test --test-reporter spec --test-reporter-destination=stdout \
+            --experimental-test-coverage --test-reporter=lcov --test-reporter-destination=lcov.info
 
       - name: Upload coverage reports to Codecov
         uses: codecov/[email protected]