Fedora Silverblue 37 podman to build VF2 image

Running within Fedora Silverblue 37, I attempted to build the VF2(visionfive 2) image from within a podman ubuntu 20.04(focal) container rather than from straight ubuntu focal.
Unfortunately, I have not been able to successfully repeat the build to get all the described VF2 build binaries and images and such with the steps described below.
Afterwards, how does one slip in/overlay the Fedora Silverblue 37 packages as much as possible into the VF2 image using the existing working VF2 kernel?
Why is it that buildroot also annoying downloads all the dependant packages from different repositories within the build process?
Why couldn't all these buildroot packages all be fetched beforehand AND THEN build?
Why is it that we don't separate the package documentation from the package binaries and optionally build documentation afterwards? This could save enormous amounts of build time when iterating through all this.

###fetch ubuntu 20.04 focal container
podman pull ubuntu:focal-20221130

### create a directory to share data between the container and the host fedora silverblue 37
mkdir -p /mnt/vf2share

###start ubuntu 20.04 focal container
podman run -v ~/vf2share:/mnt/vf2share --net host -i -t ubuntu:focal-20221130 /bin/bash

###Later we'll start it like this after it has been committed
###podman run -v /var/home/davidm/vf2share:/mnt/vf2share:Z --net host -i -t ubuntu-vf2-buildr /bin/bash

###issues with group and owner in the build.  Attempted to resolve them with this alias, but did nothing to help.
alias tar='tar --no-same-owner'

#############################inside ubuntu 20.04 focal container

mkdir visionfive2prep
cd visionfive2prep/

apt update
apt-get install curl
apt-get install git-lfs
apt-get install build-essential g++ git autoconf automake autotools-dev texinfo bison xxd curl flex gawk gdisk gperf libgmp-dev libmpfr-dev libmpc-dev libz-dev libssl-dev libncurses-dev libtool patchutils python screen texinfo unzip zlib1g-dev libyaml-dev wget cpio bc dosfstools mtools device-tree-compiler libglib2.0-dev libpixman-1-dev kpartx
apt-get install rsync
apt-get install time
apt-get install emacs-nox

curl -s https://packagecloud.io/install/repositories/github/git-lfs/script.deb.sh -o script.deb.sh
sudo bash ./script.deb.sh

git clone https://github.com/starfive-tech/VisionFive2.git

cd VisionFive2

cat .gitmodules
[submodule "buildroot"]
    path = buildroot
    url = https://github.com/starfive-tech/buildroot.git
    branch = JH7110_VisionFive2_devel
[submodule "u-boot"]
    path = u-boot
    url = https://github.com/starfive-tech/u-boot.git
    branch = JH7110_VisionFive2_devel
[submodule "linux"]
    path = linux
    url = https://github.com/starfive-tech/linux.git
    branch = JH7110_VisionFive2_devel
[submodule "opensbi"]
    path = opensbi
    url = https://github.com/starfive-tech/opensbi.git
    branch = master

Besides this one, the conf/buildroot_initramfs_config and conf/buildroot_rootfs_config also need to modify the
BR2_KERNEL_HEADERS_CUSTOM_REPO_URL="git@github.com:starfive-tech/linux.git"
to
BR2_KERNEL_HEADERS_CUSTOM_REPO_URL="https://github.com/starfive-tech/linux.git"

cd VisionFive2
git checkout JH7110_VisionFive2_devel
git submodule update --init --recursive

cd buildroot && git checkout --track origin/JH7110_VisionFive2_devel && cd ..
cd u-boot && git checkout --track origin/JH7110_VisionFive2_devel && cd ..
cd linux && git checkout --track origin/JH7110_VisionFive2_devel && cd ..
cd opensbi && git checkout master && cd ..
cd soft_3rdpart && git checkout JH7110_VisionFive2_devel && cd ..

##to capture all the build output run a shell in emacs with no color
emacs -nw --color=no
##alt-x shell
time make -j$(nproc)
#############################FINISHED ubuntu 20.04 focal container

###pause podman container
ctrl-p ctrl-q

###list podman containers
podman ps
CONTAINER ID  IMAGE                                    COMMAND     CREATED      STATUS          PORTS       NAMES
8c35f4187b36  docker.io/library/ubuntu:focal-20221130  /bin/bash   2 hours ago  Up 2 hours ago              admiring_wescoff

###save all our actions and name the container
podman commit 8c35f4187b36 ubuntu-vf2-buildr

###attach back into the running session
podman attach ubuntu-vf2-buildr

###kill any running containers
podman kill b2df210888d6

###next time you want to use this container
podman run -v /var/home/davidm/vf2share:/mnt/vf2share:Z --net host -i -t ubuntu-vf2-buildr /bin/bash