bashbrew-arch   variants
amd64     default,alpine,onbuild,slim,stretch,wheezy
ppc64le default,alpine,onbuild,slim,stretch
s390x default,alpine,onbuild,slim,stretch
arm64v8 default,alpine,onbuild,slim,stretch
arm32v7 default,onbuild,slim,stretch
arm32v6 alpine
i386 default,alpine,onbuild,slim,stretch