Publish linkerd-zipkin Docker images

[negz]

As a user of this plugin I end up having to build my own Docker image every time a new linkerd is released. It would be handy if you did that for me. :)

[negz]

Bumping this. Having to figure this image out every time I want to try out a new linkerd release demotivates me from doing so.

[dadjeibaah]

Thanks for bumping this! We will publish docker images for these real soon.

[negz]

Thanks! It would be super cool to have OpenJ9 variants published too if this is something you're automating. :)