guarnio/agent repository overview

from: https://github.com/jenkinsci/docker-agent.git⁠

4.10-4 uses debian Bullseye: docker build . -f 11/bullseye/Dockerfile --tag guarnio/agent:4.10-4

4.9-1 uses debian Buster: docker build . -f 11/buster/Dockerfile --tag guarnio/agent:4.9-1