POC to build agent-runtime-main on fedora 40 using docker

[joshcooper]

Based on #827

I'm able to build the runtime using public sources. It currently relies on a vanagon PR that hasn't been released yet:

$ 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

During iterative development, I sometimes get the following error:

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.

Which can be resolved with the following:

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