Publish images from master after each merge

[vincepri]

/kind feature

Describe the solution you'd like
We should have a way to automatically push a new master image to the staging bucket after each PR is merged to ease development, the images should be tagged and pushed with :master and :<commit-hash>.

[detiber]

There is an upstream issue for doing this for the kubernetes-csi artifacts that may help with implementing this: kubernetes/test-infra#13332

[amy]

From slack:

jdetiber  [7 minutes ago]
I was actually tracking @pohly's issue because we would like to create a prow job for cluster-api that automatically updates a `latest` tag as a postsubmit job to `master` :joy:

spiffxp  [7 minutes ago]
what we use for test-infra is https://github.com/kubernetes/test-infra/tree/master/images/builder

spiffxp  [7 minutes ago]
so maybe it’s worth asking @Katharine what it would take to make that reusable for other repos (I believe it is also used for kubernetes-sigs/slack-infra)

jdetiber  [6 minutes ago]
At least for the staging image, we're not necessarily looking to automate release images at this point, though

spiffxp  [6 minutes ago]
we build/push on merge, and then have separate PRs to update manifests using the new image

jdetiber  [6 minutes ago]
That would definitely work for us

spiffxp  [5 minutes ago]
the “catch” is that it’s via cloudbuild, but there a variety of images in https://github.com/kubernetes/test-infra/tree/master/images that get along fine with that model

https://kubernetes.slack.com/archives/CCK68P2Q2/p1563209559416100?thread_ts=1562332672.163800&cid=CCK68P2Q2

[detiber]

/reopen

This will not be resolved until we are able to get a service account from wg-k8s-infra

[k8s-ci-robot]

@detiber: Reopened this issue.

In response to this:

/reopen

This will not be resolved until we are able to get a service account from wg-k8s-infra

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[vincepri]

We're currently working on a POC to use Prow to solve this issue. More information here: https://docs.google.com/document/d/1E2GOa3b9OgrI0PS2R-UVWDRi-m_Vd3va7cOkDQHDm5w/edit#

[ncdc]

All done!
/close

[k8s-ci-robot]

@ncdc: Closing this issue.

In response to this:

All done!
/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.