Hello, I would like to know if we have to tag (or indicate) a specific commit of our repo to be considered as 'good' to be included in the shuttle? Or will be always the last one?

I asked and they will just take the most recent. It isn't clear when they actually pull it but it will be shown which version on the web site. https://skywater-pdk.slack.com/archives/C017HPHCMEY/p1624067902231500