x/build: add LUCI linux-ppc64_power10 builder

[pmur]

This will be the LUCI GOPPC64=power10 GOARCH=ppc64 GOOS=linux builder replacement for host-linux-ppc64-sid-power10.

It will share the same VM resources as host-linux-ppc64-sid-power10. The hostname should be linux-ppc64-power10.

Certificate attached: linux-ppc64-power10.csr.txt

[dmitshur]

Thanks. This is similar to #61274, except it's GOARCH=ppc64 and GOPPC64=power10.

CC @golang/release.

[gopherbot]

Change https://go.dev/cl/548217 mentions this issue: main.star: add linux-ppc64 builders

[cagedmantis]

Here's the resulting certificate: linux-ppc64-power10-1702068073.cert.txt.

The builder definitions have been added in CL 548217 so your bot should be able to connect once you follow the rest of the steps on your end.

[pmur]

Thanks! I have one instance started and running.

[dmitshur]

That was fast, and we now have its first green build!

https://ci.chromium.org/b/8762240340084651697

Thanks very much. Would you like to keep this issue open a bit longer (e.g., while you're adding more instances), or okay to close now?