How to add apt repository with Ubuntu autoinstall

I'm trying to test out the Ubuntu autoinstall and I'm struggling to figure out how to work with the apt section.

My goal is to install for example git and docker, which would look like that on a regular terminal installation:

#Python3.6
add-apt-repository ppa:deadsnakes/ppa -y
apt-get update
apt-get install python3.6 -y
#Docker -
add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable"
apt-get -y update
apt-get -y install docker-ce docker-ce-cli containerd.io

I read the documentation of the autoinstall - https://ubuntu.com/server/docs/install/autoinstall-reference

And the referenced documentation of Curtin at - https://curtin.readthedocs.io/en/latest/topics/apt_source.html

However, it's not soo clear to me who should I add the repositories.

Would appreciate any guidance or a working example.

Solution 1:

This config snippet adds the repositories to the installed system

#cloud-config
autoinstall:
  apt:
    preserve_sources_list: false
    primary:
      - arches: [amd64, i386]
        uri: http://us.archive.ubuntu.com/ubuntu
      - arches: [default]
        uri: http://ports.ubuntu.com/ubuntu-ports
    sources:
      deadsnakes-ppa:
        source: ppa:deadsnakes/ppa
      docker:
        source: deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable
        key: |
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