"Error: Not in a Firebase app directory (could not locate firebase.json)", but it is there?¿

[kovan]

Affected builder image

gcr.io/cloud-builders-community/firebase

Expected Behavior

command firebase deploy working

Actual Behavior

I get the error:

Error: Not in a Firebase app directory (could not locate firebase.json)

Even though there is a firebase.json in the current directory.

Steps to Reproduce the Problem

1. build docker image
2. docker run --rm -e GOOGLE_APPLICATION_CREDENTIALS=./backend/videosdb/keys/testing.json firebase deploy --project videosdb-testing --only=hosting
3. profit

Additional Info

Also, if I just switch to using my local firebase binary, it deploys well. I.E. Removing the "docker run --rm -e" part of the above command.

Thank you for your time. I am avaiable for testing.