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Here is an example config that influences partitions and adds two extra partitions: https://github.com/rancher/elemental-toolkit/blob/78d856f2d24eec8e81682fd1c6f65c60c3ff6e1a/config.yaml.example#L28-L50

How does one use the customized config for example during an install? I was expecting that i could also provide it as a parameter to the install like

elemental install -c http://../config.yaml /dev/sda

. Or is this customizzed config only used when placed inside the mentioned places in the container image?

/etc/os-release
<config-dir>/config.yaml
<config-dir>/config.d/*.yaml

Yep, it needs to be added to the container image or otherwise copied before running the install-step..