OCI "Out of host capacity" on A1.Flex: a retry loop with the CLI, and the two checks to do first

Oracle's Always Free tier gives every tenancy 1,500 OCPU-hours and 9,000 GB-hours a month of VM.Standard.A1.Flex, which is a 2 OCPU / 12 GB Arm VM running all month. It also gives, in many regions, th