add nix shell ci

.github/workflows/test.yaml

@@ -178,6 +178,22 @@ jobs:
             ./configure
             ./install-sh
 
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
+
+      - name: Run tests
+        run: |
+          nix-shell --run "sh scripts/run_tests.sh symlinks summary exit_status unzip_D_flag_commit hidden_variables command_substitution reuse_problematic_sandbox toplevel-perms empty_summary merge_multiple_dirs touch_and_rm_no_flag reuse_sandbox mkdir_on_file all-commit-cases unzip_D_flag_commit_without_cleanup unzip_no_flag pipeline touch_and_rm_D_flag_commit network ignore_flag dev_urandom nonexistent_sandbox"
+
+
   prerelease:
     needs:
       - test-checkout