chore: use github app token for release automation (#4)

Author: quettabit

.github/workflows/release-please.yml

@@ -16,8 +16,14 @@ jobs:
       release_created: ${{ steps.release.outputs.release_created }}
       tag_name: ${{ steps.release.outputs.tag_name }}
     steps:
+      - uses: actions/create-github-app-token@v1
+        id: app-token
+        with:
+          app-id: ${{ secrets.RELEASE_PLZ_APP_ID }}
+          private-key: ${{ secrets.RELEASE_PLZ_APP_PRIVATE_KEY }}
       - uses: googleapis/release-please-action@v4
         id: release
         with:
           config-file: release-please-config.json
           manifest-file: .release-please-manifest.json
+          token: ${{ steps.app-token.outputs.token }}