ci: update CI to check nushell scripts

.github/workflows/ci.yaml

@@ -36,3 +36,18 @@ jobs:
     - name: Install Rust
       run: rustup update stable && rustup default stable && rustup component add rustfmt
     - run: cargo fmt -- --check
+
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - uses: hustcer/setup-nu@v2.1
+      with:
+        check-latest: true
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    - run: |
+        echo "Nushell version: $(nu -c '(version).version')"
+        for i in tests/snapshots/*.nu; do nu -c "print -n $'(ansi green)Checking $i ...'; ansi reset; source $i"; done
+      shell: bash