build: legacy Convenience Image Deprecation
build: legacy Convenience Image Deprecation

Fixes https://discuss.circleci.com/t/legacy-convenience-image-deprecation/41034
ronnymikalsen/ngx-mime,raymondkarstensen/ngx-mime,NationalLibraryOfNorway/ngx-mime,ronnymikalsen/ngx-mime,NationalLibraryOfNorway/ngx-mime,raymondkarstensen/ngx-mime,NationalLibraryOfNorway/ngx-mime,ronnymikalsen/ngx-mime,raymondkarstensen/ngx-mime,raymondkarstensen/ngx-mime,ronnymikalsen/ngx-mime,NationalLibraryOfNorway/ngx-mime