Deploying to Heroku from GitHub Actions - nobu0605/accounting-application GitHub Wiki
At first, we have to deploy this app to Heroku manually.
If you encounter this error, please remove yarn.lock file.
Two different lockfiles found: package-lock.json and yarn.lock
We need to set up the necessary package for deployment.
https://qiita.com/nobu0605/items/355f1e890ad8dff8eb8f