fix: auto publish to npm

.github/workflows/release-please.yml

@@ -14,7 +14,25 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: google-github-actions/release-please-action@v3
+        id: release
         with:
           release-type: node
           package-name: unchained-bitcoin
           command: manifest
+
+      # 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.releases_created }}
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 18
+          registry-url: 'https://registry.npmjs.org'
+        if: ${{ steps.release.outputs.releases_created }}
+      - run: npm ci
+        if: ${{ steps.release.outputs.releases_created }}
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}
+        if: ${{ steps.release.outputs.releases_created }}