Initial release

Dockerfile

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+FROM ubuntu
+RUN apt update
+RUN apt install -y debootstrap xz-utils
+COPY make.sh /
+RUN /make.sh
+RUN tar -cv sysroot/ > /tmp/sysroot.tar
+RUN xz -9 -e -z /tmp/sysroot.tar
+RUN mv /tmp/sysroot.tar.xz /tmp/sysroot-`uname -m`.tar.xz
+RUN ls -l /tmp/sysroot-`uname -m`.tar.xz

build.sh

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+#!/bin/bash
+docker build . --platform linux/amd64 -t sysroot_amd64
+docker build . --platform linux/arm64 -t sysroot_arm64
+
+docker run --rm -it -v `pwd`:/output/ --platform linux/amd64 -t sysroot_amd64 sh -c "cp /tmp/sysroot-* /output/"
+docker run --rm -it -v `pwd`:/output/ --platform linux/arm64 -t sysroot_arm64 sh -c "cp /tmp/sysroot-* /output/"

make.sh

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+#!/bin/bash
+if [[ `uname -m` == "aarch64" ]]; then
+  debootstrap                                          \
+    --include=ca-certificates,curl,file,libc6-dev,make \
+    --no-merged-usr --variant=minbase xenial /sysroot  \
+    http://ports.ubuntu.com/
+else                                                   
+  debootstrap                                          \
+    --include=ca-certificates,curl,file,libc6-dev,make \
+    --no-merged-usr --variant=minbase xenial /sysroot  \
+    http://azure.archive.ubuntu.com/ubuntu
+fi