add build workflow

.github/workflows/build.yml

@@ -0,0 +1,37 @@
+name: test
+
+on:
+  pull_request:
+  push:
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    steps:
+      - name: checkout
+        uses: actions/checkout@v3
+
+      - name: Install stable toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+
+      - name: install nushell
+        uses: taiki-e/install-action@v1
+        with:
+          tool: nu
+
+      - name: cargo build
+        run: cargo build
+
+      - name: test
+        env:
+          RUST_LOG: debug
+        run: nu -c 'register ${{ github.workspace }}/**/nu_plugin_dns; dns query google.com'