no error message when wrong keys are in ISO files, boot fails
when the ISO image generated by alpine-iso does not contain the keys used for signing the embedded index, the boot fails with “/sbin/init not found in new root”. The reason is that all “apk add” before failed because the wrong keys are in the ISO file.
An explicit, non-confusing error message would be
“cannot install startup APKs, key not known.”
(from redmine: issue id 6253, created on 2016-10-02)