x/build: run cl2issue on GKE

[bradfitz]

As part of #18817 ("Kubernetes-ify all misc build services & bots"), this is a tracking bug to also migrate @rsc's https://godoc.org/rsc.io/github/cl2issue bot:

@rsc writes:

The code is in rsc.io/github/cl2issue if anyone wants to make it part of the build infrastructure (please!).

/cc @kevinburke @rakyll @quentinmit

[mxplusb]

Is there a base container image to use?

[bradfitz]

The new plan is to put this functionality into golang.org/x/build/cmd/gopher

There's an outstanding CL (https://go-review.googlesource.com/c/39352/) that indexes the github references. Once that's in, this becomes a few lines in gopherbot.

[mxplusb]

Cool, should this be closed, then?

[rsc]

It should be closed once the new bot is running.

[kevinburke]

I'm happy to take this one... Currently cl2issue calls exec.Command("issue", ...) which seems a little funky since issue is also a Go binary. It seems like we could just make a function call from within the same process and avoid needing to install a separate binary.

[bradfitz]

Kevin, this will just be a few line gopherbot task like the others, once CL 39352 is in.

[gopherbot]

CL https://golang.org/cl/39352 mentions this issue.