Thanks @dmorrow, appreciate the initiative! The lack of CI/CD guidance has also just been discussed (and acknowledged) in Join us for a Developer AMA with Tim Pettersen - #9 by sopel, where I also referenced a recent Atlassian blog post that seems to be a good starting point for a guide (Bitbucket Pipelines though, ideally a guide would also cover GitHub indeed):
- […] I just stumbled over Damien Lauberton’s recent and comprehensive blog post How to Configure CI/CD for an Atlassian Forge App […], and it has neither been announced in the community nor referenced from the Forge docs yet, maybe you could derive (and maintain) a tutorial from it?