How to build an image from the source tarball

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+Docker allows one to build on a specific version of an operating
+system without having that version installed on the host.  This
+example was tested on Debian Bullseye, but the build was actually
+done on the Ubuntu Bionic Docker image.
+
+The following docker related packages were installed:
+
+  ii  docker-ce                                     5:20.10.14~3-0~debian-bullseye   amd64        Docker: the open-source application container engine
+  ii  docker-ce-cli                                 5:20.10.14~3-0~debian-bullseye   amd64        Docker CLI: the open-source application container engine
+  ii  docker-ce-rootless-extras                     5:20.10.14~3-0~debian-bullseye   amd64        Rootless support for Docker.
+  ii  docker-scan-plugin                            0.17.0~debian-bullseye           amd64        Docker scan cli plugin.
+
+build-docker.sh was run from the command line to create the docker container called mlinux-build
+
+The build starts sshd, but is is not needed if you use the docker
+exec command to attach to the Docker image as us done in
+build-mlinux.sh.
+
+After the build is complete you should have a login shell.  You
+could the do:
+
+  su -l mlbuilder
+  build-mlinux.sh
+
+After the build completes, the output files can be copied from the host
+as follows:
+
+  docker cp mlinux-build:/home/mlbuilder/mlinux-6.0.0/build/tmp/deploy/images/mtcdt/mlinux-base-image-mtcdt-upgrade-withboot.bin .