Log advice when a newer Go version is required under Actions

go/extractor/cli/go-autobuilder/go-autobuilder.go

@@ -800,6 +800,9 @@ func installDependenciesAndBuild() {
 	// Go tooling should install required Go versions as needed.
 	if semver.Compare(getEnvGoSemVer(), "v1.21.0") < 0 && goVersionInfo.Found && semver.Compare("v"+goVersionInfo.Version, getEnvGoSemVer()) > 0 {
 		diagnostics.EmitNewerGoVersionNeeded()
+		if val, _ := os.LookupEnv("GITHUB_ACTIONS"); val == "true" {
+			log.Printf("The go.mod version is newer than the installed version of Go. Consider adding an actions/setup-go step to your workflow.\n")
+		}
 	}
 
 	fixGoVendorIssues(&buildInfo, goVersionInfo.Found)