Add npm publishing workflow

Author: tenderlove

.github/workflows/publish-npm.yml

@@ -0,0 +1,47 @@
+name: Publish to npmjs.com
+on:
+  push:
+    tags: ['v*']  # Triggers when pushing tags starting with 'v'
+jobs:
+  publish:
+    if: github.repository == 'ruby/prism'
+    runs-on: ubuntu-latest
+    environment: release  # Optional: for enhanced security
+    permissions:
+      id-token: write     # Required for OIDC token exchange
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@v2
+        with:
+          egress-policy: audit
+      - uses: actions/checkout@v5
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+
+      - name: Set up node
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: Install dependencies
+        run: bundle install --jobs 4 --retry 3
+
+      - name: rake templates
+        run: bundle exec rake templates
+
+      - name: Set up WASI-SDK
+        run: |
+          wget https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-25/wasi-sdk-25.0-x86_64-linux.tar.gz
+          tar xvf wasi-sdk-25.0-x86_64-linux.tar.gz
+
+      - name: Build the project
+        run: make wasm WASI_SDK_PATH=$(pwd)/wasi-sdk-25.0-x86_64-linux
+
+      - name: Update npm
+        run: npm install -g npm@latest
+
+      - run: npm publish