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We currently build FCOS rawhide AWS images for both x86_64 and aarch64, but don't create AMIs.[1] We could do so if there's demand for it. Part of the issue there is garbage collection, which is something we'd like to tackle soon.
There is a lambda function running in our AWS account that can help with this. It automatically deletes AMIs, EBS Volumes, Snapshots or instances based on tag. You just need to use the tag "Delete":"<delta_in_days>"
For example, if you tag your AMIs with "Delete": "200" they will be automatically cleaned up when they reach 200 days old.
Mark