Something like
git clone https://github.com/armbian/build.git -b main
cd build
git remote add -f imx8mp-build https://github.com/OLIMEX/imx8mp-build.git
git remote update
git fetch origin
git fetch imx8mp-build
git checkout main
git rebase imx8mp-build/bookworm
# fix conflict
vi VERSION
git add VERSION
git rebase --continue
# fix conflict
vi .github/dependabot.yml
git add .github/dependabot.yml
git rebase --continue
git log