add preview workflow

Author: natemoo-re

.github/workflows/preview.yml

@@ -0,0 +1,25 @@
+name: Preview
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install pnpm
+        uses: pnpm/action-setup@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          registry-url: https://registry.npmjs.org/
+          cache: "pnpm"
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - run: pnpx pkg-pr-new publish './packages/*'