gh-bridge: fix startup sequence
gh-bridge: fix startup sequence

On startup, compute the diff between the private and public branch to infer
the right sequence of API calls to make to GitHub. Once this is done, only
consider the changes done in public branch.

Signed-off-by: Thomas Gazagnaire <5f50a84c1fa3bcff146405017f36aec1a10a9e38@gazagnaire.org>

docker/datakit,docker/datakit,docker/datakit