Go 1.18 BuildInfo support

What version of rules_go are you using?

v0.30.0

What version of gazelle are you using?

6bbfc47f1b0a27ee1efeddcc6671f3e4e03235dc

What version of Bazel are you using?

Build label: 5.0.0
Build target: bazel-out/k8-opt/bin/src/main/java/com/google/devtools/build/lib/bazel/BazelServer_deploy.jar
Build time: Wed Jan 19 14:08:54 2022 (1642601334)
Build timestamp: 1642601334
Build timestamp as int: 1642601334

Does this issue reproduce with the latest releases of all the above?

Yes.

What operating system and processor architecture are you using?

% uname -sm
Linux x86_64

and

% uname -sm
Darwin arm64

What did you do?

Wrote a program that tries to access build information via runtime/debug.ReadBuildInfo and built it inside a Git repository.

package main

import (
	"fmt"
	"runtime/debug"
)

func main() {
	info, ok := debug.ReadBuildInfo()
	fmt.Println(info, ok)
}

What did you expect to see?

Information about the build environment.

What did you see instead?

<nil> false

Start by reproducing the reported Go program using runtime/debug.ReadBuildInfo while building inside a Git repository. Trace how rules_go and Bazel provide Go build metadata, then verify that the program reports build information instead of nil and false on the listed Linux and macOS environments.