Repository: nodejs/node
Pull request: tools: use sparse checkout in `build-tarball.yml`

Avoiding to clone the whole repo should speed up the workflow, and also validate that we are not unknowingly depending on something in the repo (i.e. validate that tarballs are self sufficient to build Node.js).

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Changed files:
filename: .github/workflows/build-tarball.yml
patch: @@ -74,6 +74,8 @@ jobs:
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8  # v5.0.0
         with:
           persist-credentials: false
+          sparse-checkout: .github/actions/install-clang
+          sparse-checkout-cone-mode: false
       - name: Install Clang ${{ env.CLANG_VERSION }}
         uses: ./.github/actions/install-clang
         with:
@@ -97,15 +99,19 @@ jobs:
         run: |
           tar xzf tarballs/*.tar.gz -C $RUNNER_TEMP
           echo "TAR_DIR=$RUNNER_TEMP/`basename tarballs/*.tar.gz .tar.gz`" >> $GITHUB_ENV
-      - name: Copy directories needed for testing
-        run: |
-          cp -r tools/eslint $TAR_DIR/tools
-          cp -r tools/eslint-rules $TAR_DIR/tools
       - name: Build
         run: |
-          cd $TAR_DIR
-          make build-ci -j4 V=1
+          make -C "$TAR_DIR" build-ci -j4 V=1
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8  # v5.0.0
+        with:
+          persist-credentials: false
+          sparse-checkout: |
+            tools/eslint
+            tools/eslint-rules
+      - name: Move directories needed for testing
+        run: |
+          mv tools/eslint "$TAR_DIR/tools"
+          mv tools/eslint-rules "$TAR_DIR/tools"
       - name: Test
         run: |
-          cd $TAR_DIR
-          make run-ci -j4 V=1 TEST_CI_ARGS="-p dots  --measure-flakiness 9"
+          make -C "$TAR_DIR" run-ci -j4 V=1 TEST_CI_ARGS="-p dots --measure-flakiness 9"