Remove fallback to configured git user (#4928)

When we don't have a known CI environment variable we can rely on the
token that is used to submit the Run to associate the user. The backend
already handles this case

cli/internal/runsummary/run_summary.go

@@ -14,7 +14,6 @@ import (
 	"github.com/vercel/turbo/cli/internal/ci"
 	"github.com/vercel/turbo/cli/internal/client"
 	"github.com/vercel/turbo/cli/internal/env"
-	"github.com/vercel/turbo/cli/internal/scm"
 	"github.com/vercel/turbo/cli/internal/spinner"
 	"github.com/vercel/turbo/cli/internal/turbopath"
 	"github.com/vercel/turbo/cli/internal/util"
@@ -344,9 +343,5 @@ func getUser(envVars env.EnvironmentVariableMap, dir turbopath.AbsoluteSystemPat
 		username = envVars[vendor.UsernameEnvVar]
 	}
 
-	if username == "" {
-		username = scm.GetCurrentUser(dir)
-	}
-
 	return username
 }

cli/internal/scm/scm.go

@@ -78,17 +78,3 @@ func GetCurrentSha(dir turbopath.AbsoluteSystemPath) string {
 	}
 	return strings.TrimRight(string(out), "\n")
 }
-
-// GetCurrentUser returns the local user.name
-// We do not specify a --local or --global flag so it should
-// resolve the value the same way git does when creating a commit.
-func GetCurrentUser(dir turbopath.AbsoluteSystemPath) string {
-	cmd := exec.Command("git", []string{"config", "user.name"}...)
-	cmd.Dir = dir.ToString()
-
-	out, err := cmd.Output()
-	if err != nil {
-		return ""
-	}
-	return strings.TrimRight(string(out), "\n")
-}