Great, but why on GitHub? That doesn't seem very souverain to me
When MS pulls services you are largely screwed.
When GitHub pulls services its a few hours downtime and a new provider.
Literally the "gotcha" fool from the Matt Bors cartoon: https://thenib.com/mister-gotcha/
The word is not ironic it is pragmatic.
*Lieu de Rencontre Français Pour le Contrôle de Version
Don't let perfect be the enemy of good.
That does not sound very sovereign by the US to me.
You can take some open source software made in some other country and use it or fork it no strings attached to its country of origin. No leader from that country can decide to abruptly cut you off your usage of the software because they feel like it.