Comment 3 for bug 1945225

> how would one insert such a file during (and early enough) in the commissioning process?

well, i'll leave that one up to the maas team to answer properly, but i think there are ways to use custom commissioning scripts:
https://maas.io/docs/commissioning-scripts-reference

or even custom commissioning images:
https://maas.io/docs/image-builder