Firebase: Can't finde npm package

Thank you for this hint! changing the command to
- run: name: Deploy Master to Firebase command: ./node_modules/.bin/firebase deploy --token=$FIREBASE_DEPLOY_TOKEN
has worked!

But now this command seems to be executed in the wrong location (not in the root folder): Error: Not in a Firebase app directory (could not locate firebase.json) Exited with code 1
Does anyone know how to solve that?