Support testgrid annotations in other repos

[howardjohn]

What would you like to be added:
I would like to be able to use testgrid annotation in job config that is outside of k/test-infra. See istio/test-infra#1475

Why is this needed:
Keeping the testgrid in sync manually is virtually impossible. In order to get testgrid working for us, we will need a process that will automatically open PRs against this repo and keep the testgrid in sync, which is a bit of a pain.

Alternatively, we would be interesting in our own deployment of testgrid when it is open sourced, which would probably solve this problem

[chases2]

@fejta
/assign

Our proposed strategy to deal with this is the following:

• Create a tool that allows prow annotations to be converted to a YAML file that could be placed in a Testgrid Config folder (shard testgrid config #13541) via a "bump" script. In this way, external instances of Prow can control and output their testgrid configurations.
• Eventually, once Testgrids can be deployed OS in parallel to an existing prow deployment, the bump script can be removed and replaced with Testgrid's tooling for reading prow annotations.

[chases2]

/area testgrid

[spiffxp]

/sig testing

[chases2]

Now that there is documentation showing this use case for Configurator, and Istio has used it for this purpose (#13699), I'm closing this issue for now.

Further development will come as one of the general use cases for open-sourcing Testgrid (#10409), and should be tracked there or in a separate issue.

/close

[k8s-ci-robot]

@chases2: Closing this issue.

In response to this:

Now that there is documentation showing this use case for Configurator, and Istio has used it for this purpose (#13699), I'm closing this issue for now.

Further development will come as one of the general use cases for open-sourcing Testgrid (#10409), and should be tracked there or in a separate issue.

/close

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