I have a service account and key json file contents in my process. Trying to spawn "docker gcr.io/my-project/my-image" to upload images to container registry.

I tried docker login -u _json_key -p "$(cat keyfile.json)" https://[HOSTNAME] from Advanced Authentication tutorial, which returns success during login, but still docker push returns error:

You do not currently have an active account selected.
Please run:

  $ gcloud auth login

Ideally, I would like to trigger docker push without configuring gcloud SDK. Also would not want to store key json contents to a file. I'd like to keep it in process memory.