Host key reuse in SSH build agent Docker images

The https://hub.docker.com/r/jenkins/ssh-agentjenkins/ssh-agent and deprecated https://hub.docker.com/r/jenkins/ssh-slavejenkins/ssh-slave Docker images can be used to set up a build agent for use via the SSH Build Agents plugin. In jenkins/ssh-agent 6.11.1 and earlier and all versions of...