chore: Add release-please to automate releases

Author: nzakas

.github/workflows/release-please.yml

@@ -0,0 +1,39 @@
+on:
+  push:
+    branches:
+      - main
+name: release-please
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: GoogleCloudPlatform/release-please-action@v2
+        id: release
+        with:
+          release-type: node
+          package-name: test-release-please
+      # The logic below handles the npm publication:
+      - uses: actions/checkout@v3
+        # these if statements ensure that a publication only occurs when
+        # a new release is created:
+        if: ${{ steps.release.outputs.release_created }}
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 16
+          registry-url: 'https://registry.npmjs.org'
+        if: ${{ steps.release.outputs.release_created }}
+      - run: npm ci
+        if: ${{ steps.release.outputs.release_created }}
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}
+        if: ${{ steps.release.outputs.release_created }}
+
+      # Tweets out release announcement
+      - run: 'npx @humanwhocodes/tweet "${{ github.event.repository.full_name }} v${{ steps.release.outputs.major }}.${{ steps.release.outputs.minor }}.${{ steps.release.outputs.patch }} has been released!\n\n${{ github.event.repository.html_url }}/releases/tag/v${{ steps.release.outputs.major }}.${{ steps.release.outputs.minor }}.${{ steps.release.outputs.patch }}"'
+        if: ${{ steps.release.outputs.release_created }}
+        env:
+          TWITTER_CONSUMER_KEY: ${{ secrets.TWITTER_CONSUMER_KEY }}
+          TWITTER_CONSUMER_SECRET: ${{ secrets.TWITTER_CONSUMER_SECRET }}
+          TWITTER_ACCESS_TOKEN_KEY: ${{ secrets.TWITTER_ACCESS_TOKEN_KEY }}
+          TWITTER_ACCESS_TOKEN_SECRET: ${{ secrets.TWITTER_ACCESS_TOKEN_SECRET }}