publish on a new tag (#6057)

* publish on push to stable

.github/workflows/publish.yaml

@@ -0,0 +1,31 @@
+name: Publish to npm
+
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  publish-npm:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js 18.x
+        uses: actions/setup-node@v4
+        with:
+          node-version: 18.x
+          cache: 'npm'
+          registry-url: 'https://registry.npmjs.org/'
+
+      - name: Install Dependencies
+        run: npm install
+
+      - name: Build PlayCanvas
+        run: npm run build:publish
+
+      - name: Publish to npm
+        run: npm publish --DRY-RUN
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}