* move config variables from alpine-ami.yaml to variables.json-*
+ variables.json-default - ready-for-action original default config
+ variables.json-example - original defaults with comments
* clean up tabs vs. spaces in make_ami.sh
* make_ami.sh handles custom kernel flavor, extra repos, and extra packages
* tweak README with regards to aws-ena-driver caveat
* add public_ip variable, setting to 'true' allows packer to build from outside AWS
* use smallest instance_type (t2.nano) and volume_size (1 GiB)
* eu-west-3 region is live; ap-northeast-3 requires subscription
* no longer need setup_staging_repos function...
+ tiny-ec2-bootstrap is available in main since v3.8
+ aws-ena-driver-vanilla is only available in edge/testing
* switched to linux-vanilla since linux-hardened is no longer available and linux-virt does not have NVME available
+ TODO? make kernel choice selectable (significant memory/disk savings linux-virt can be used)
