tools: use sparse checkout in build-tarball.yml

PR-URL: #59788
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Pietro Marchini <pietro.marchini94@gmail.com>

Author: aduh95

.github/workflows/build-tarball.yml

@@ -73,6 +73,8 @@ jobs:
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8  # v5.0.0
         with:
           persist-credentials: false
+          sparse-checkout: .github/actions/install-clang
+          sparse-checkout-cone-mode: false
       - name: Set up Python ${{ env.PYTHON_VERSION }}
         uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065  # v5.6.0
         with:
@@ -92,15 +94,19 @@ 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"