The game-engine i develop for has a hook on github, which looks for commits in the format of VERSION{xx.xx}. If it finds such a commit, it zips the game, then

The game-engine i develop for has a hook on github, which looks for commits in the format of VERSION{xx.xx}. If it finds such a commit, it zips the game, then compares the zip against the previous install, then it computes changes and creates shards. These are downloaded via RAPID and create -with the previous shards a image of the game in the engines local install. After that its buisness as usual.