chore: auto-publish package to npm after release

.github/workflows/release-please.yml

@@ -13,3 +13,17 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
           release-type: node
           package-name: node-core-utils
+      # The logic below handles the npm publication:
+      - uses: actions/checkout@v2
+        # 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@v1
+        with:
+          node-version: 14.x
+          registry-url: 'https://registry.npmjs.org'
+        if: ${{ steps.release.outputs.release_created }}
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}
+        if: ${{ steps.release.outputs.release_created }}