x/build: move beta.golang.org to GKE #19867
tip.golang.org runs on GKE (see x/tools/cmd/tip *.yaml)
beta.golang.org runs on a manually-managed GCE VM.
This bug is about migrating beta.golang.org to GKE also.
I suppose it could just be the the same as the tip codebase, but with a flag that makes it use the latest tagged beta or rc.
e.g. every 15 minutes, look at go.googlesource.com or github remote tags,
And look at anything containing "beta" or "rc" in the tag name.
Then find the thing with the most recent date, and make the "tip" binary switch to that.
Once maintner is deployed (#19866) soon here, the tip binary could just poll maintner to ask that question about which version is the latest beta.