But what do you do with the signatures on the signed commits? It is of some, limited value, to GPG sign because it does provide a little bit more of "John Hancock" for a release, but how does this work in a continuous integration environment? Does the CI server reject commits that are not properly signed? Does the server refuse to run unsigned or incorrectly signed Git deployed code?
It provides a confirmation that the person who's name & email are on a commit actually made the commit. I can configure my instance of git to make commits as "Linus Torvalds <torvalds@linux-foundation.org>", but only the real Linus can sign them with a publicly-verifiable GPG key.
