* continue to use provided 'release' value if specified
* continue to use 'edge' for edge versions
* deduce 'release' value from the version on the alpine-base APK in https://dl-cdn.alpinelinux.org/alpine/v<version/main/<arch>/
* update test profile with 3.13
3.13.0 release
* add version 3.13 profile
* 3.13 end-of-life is 2022-11-01
* note we're an official Alpine project now!
* releases/alpine.yaml has been "--trim release"'d
* updated releases/README.md
scripts/builder.py
* fix ReleaseReadme() to not die when release contains "_rc"
* add --trim to releases-yaml
* tweak some --help for release-yaml and prune
scripts/setup-ami
* explicitly lock AMI root account