Adding workflow to publish to NPM on a github release

.github/workflows/npm-publish.yml

@@ -0,0 +1,40 @@
+# This workflow will run tests using node and then publish a package to GitHub Packages when a release is created
+# For more information see: https://docs.github.com/en/actions/publishing-packages/publishing-nodejs-packages
+
+name: Publish to NPM
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 16
+      - run: npm ci
+      - run: npm test
+
+  main-branch-check:
+    needs: build-and-test
+    if: ${{ github.repository == 'auth0/node-jsonwebtoken' }} && ${{ github.ref == 'refs/heads/master' }}  
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "Publishing package to NPM"
+
+  publish-npm:
+    needs: main-branch-check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 16
+          registry-url: https://registry.npmjs.org/
+      - run: npm ci
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.npm_token}}