Have you seen the unofficial version Beezim has released? It is for RHEL/CentOS, but interesting - http://www.beezim.fr/pages/zimbra-9-oss/
I was looking at how to build your own distros yesterday, and I think the steps are quite clear here: So, for Ubuntu 18.04, I think it will be something like (change the docker image to produce the binaries for different OS):
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docker run -it zimbra/zm-base-os:devcore-ubuntu-18.04 bash
mkdir installer-build
cd installer-build
git clone https://github.com/Zimbra/zm-build.git
cd zm-build
git checkout origin/develop
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ssh-keygen -t rsa -b 4096 -C "your_email@example.com"
And finally, something like this for the build:
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./build.pl --build-no=0001 --build-ts=`date +'%Y%m%d%H%M%S'` \
--build-release=KEPLER --build-release-no=9.0.0 \
--build-release-candidate=GA --build-type=FOSS \
--git-default-branch=release/9.0.0 --build-thirdparty-server=files.zimbra.com \
--no-interactive
Let me know if somebody tries it, I am not 100% sure I have all the variables.