Hi Samstern,
I tried to use your repository for the firestore backup using cron.yml. It is creating the bucket but writing 0 bytes.
I have a question about this line:
const url = https://firestore.googleapis.com/v1beta1/projects/${projectId}/databases/(default):exportDocuments;
I have hardcoded like this: const url = 'https://firestore.googleapis.com/v1beta1/projects/cp-gaa-dev-dragonfly-arc/databases/(default):exportDocuments'

Please let me know what I am doing wrong.
Thanks
BC