Figure out why OIDC authentication failed on first invocation of Cloud Run

[kkom]

2019-09-29 17:37:51.095 CESTGET4030 B0 msGoogle-Cloud-Scheduler https://gdrive-backup-a43abwwixq-ew.a.run.app/gdrive-backup
The request was not authenticated. Either allow unauthenticated invocations or set the proper Authorization header. Read more at https://cloud.google.com/run/docs/securing/authenticating

Maybe should do OAuth instead? Couldn't figure out how to set up OAuth in Terraform on first try:

gdrive-backup/main.tf

Lines 229 to 231 in d5229fc

	oidc_token {
	service_account_email = google_service_account.cloud_run_invoker.email
	}