$ export VANAGON_LOCATION=https://github.com/puppetlabs/vanagon#main
$ bundle update
$ docker pull fedora:40                                                  
40: Pulling from library/fedora
Digest: sha256:bd0b8ed03d00b53d8cefab42c6a9ffac4b90a72f8934355a009ac5fb1258040b
Status: Image is up to date for fedora:40
docker.io/library/fedora:40
$ bundle exec vanagon build agent-runtime-main fedora-40-x86_64 -e docker

docker: Error response from daemon: Conflict. The container name "/fedora_40-builder" is already in use by container "707cb97e2d4d2f854cddca125fdf66574b7a47f892a1ed86a99e7403fd45508f". You have to remove (or rename) that container to be able to reuse that name.

$ docker kill $(docker ps -q) 
$ docker remove fedora_40-builder