fix: Fix automatic release with release-please bot (#486)

.github/workflows/release-please.yml

@@ -10,6 +10,27 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: google-github-actions/release-please-action@v3
+        id: release
         with:
           release-type: node
           package-name: release-please-action
+      # Due to Github Actions design, releases created by this action won't trigger
+      # new Actions like `npm-publish.ym`, so we have to handle the npm publication here.
+      # More info:
+      # https://github.com/google-github-actions/release-please-action/issues/402
+      # https://github.com/googleapis/release-please/issues/1142
+      - 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: 16
+          registry-url: https://registry.npmjs.org/
+        if: ${{ steps.release.outputs.release_created }}
+      - run: yarn install --frozen-lockfile
+        if: ${{ steps.release.outputs.release_created }}
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}
+        if: ${{ steps.release.outputs.release_created }}