req.Tag was only echoed in the HTTP response, never used to match jobs.
Compose mode didn't care (ComposeExecutor re-pulls the compose file's own
pinned tag), but SwarmExecutor sets the service image directly from
Job.Image, which was built from the untagged req.Image alone -- so a
Swarm deploy silently rewrote the service to :latest instead of the
requested tag. Build the full image:tag reference once in the handler
and pass it into FindJobs; NormaliseImage/ImagesMatch already strip
tags before matching, so this doesn't change which jobs match in either
mode.
shcizo