Add support for sparse checkouts

.github/workflows/test.yml

@@ -72,6 +72,19 @@ jobs:
         shell: bash
         run: __test__/verify-side-by-side.sh
 
+      # Sparse checkout
+      - name: Sparse checkout
+        uses: ./
+        with:
+          sparse-checkout: |
+            __test__
+            .github
+            dist
+          path: sparse-checkout
+
+      - name: Verify sparse checkout
+        run: __test__/verify-sparse-checkout.sh
+
       # LFS
       - name: Checkout LFS
         uses: ./