A Jenkins agent using SSH to establish connection.
See Jenkins Distributed builds for more info.
To run a Docker container
docker run jenkins/ssh-slave "<public key>"
You'll then be able to connect this agent using the SSH Build Agents plugin as "jenkins" with the matching private key.
To use this image with Docker Plugin, you need to
pass the public SSH key using environment variable JENKINS_SLAVE_SSH_PUBKEY
and not as a startup argument.
In Environment field of the Docker Template (advanced section), just add:
JENKINS_SLAVE_SSH_PUBKEY=<YOUR PUBLIC SSH KEY HERE>
Don't put quotes around the public key. You should be all set.
See GitHub Releases. Note that the changelogs and release tags were introduced in Dec 2019, and there is no entries for previous patches. Please consult with the commit history if needed.