keychain is cool but is first of all unmaintained, and only really works
in the context of a shell. since it "dynamically" starts agents and
exports variables (with set -U to make matters worse), nothing exists
outside of the context of the shell which makes it impossible to sign
commits in gui apps (except vscode for some reason); using a classical
ssh-agent with the env var exported by hand simply works
uku
aa4aac6063
