Add npm publish action on milestone closed

.github/workflows/npm-publish.yml

@@ -0,0 +1,38 @@
+# This workflow will run tests using node and then publish a package to GitHub Packages when a milestone is closed
+# For more information see: https://help.github.com/actions/language-and-framework-guides/publishing-nodejs-packages
+
+name: Node.js Package
+
+on:
+  milestone:
+    types: [closed]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 16
+      - run: npm ci
+      - run: npm test
+
+  publish-npm:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 16
+          registry-url: https://registry.npmjs.org/
+      - run: npm ci
+      - run: |
+          git config user.name github-actions
+          git config user.email github-actions@github.com
+      - run: npm version ${{ github.event.milestone.title }}
+      - run: git push && git push --tags
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.npm_token}}