Move prerelease deployment to workflow directory (#4523)

.github/workflows/npm-prerelease.yml

@@ -0,0 +1,33 @@
+# This workflow will run tests using node and then publish a package to npmjs when a prerelease is created
+# For more information see: https://help.github.com/actions/language-and-framework-guides/publishing-nodejs-packages
+
+name: npm_prerelease
+
+on:
+  release:
+    types: [prereleased]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 14
+      - run: npm install
+      - run: npm test
+
+  publish-npm-prerelease:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 14
+          registry-url: https://registry.npmjs.org/
+      - run: npm install
+      - run: npm publish --access public --tag unstable
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}