chore: add GitHub Actions workflow for publishing to NPM (#35)

Author: Yukaii

.github/workflows/publish.yml

@@ -0,0 +1,34 @@
+name: Publish to NPM
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          registry-url: 'https://registry.npmjs.org'
+          cache: 'npm'
+          cache-dependency-path: nodejs/package-lock.json
+
+      - name: Install dependencies
+        working-directory: nodejs
+        run: npm ci
+
+      - name: Build
+        working-directory: nodejs
+        run: npm run build
+
+      - name: Publish to NPM
+        working-directory: nodejs
+        run: npm publish --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}