If reauth is required, show the full command-line path of the binary (#…

…47)

The error message that gets printed out tells me to login again.
However, it doesn't show the full path of the binary that was used to
run the credential helper.

internal/autherr/coded_error.go

@@ -17,6 +17,8 @@ package autherr
 import (
 	"errors"
 	"fmt"
+	"os"
+	"path/filepath"
 )
 
 const (
@@ -56,6 +58,7 @@ func CodedErrorf(code int, format string, args ...any) error {
 func ReauthRequired(cluster string) error {
 	const reauthMessage = "Missing/invalid/expired credentials for cluster: %s\n" +
 		"Please refresh credentials by running:\n\n\t" +
-		"engflow_auth login %s\n"
-	return CodedErrorf(CodeReauthRequired, reauthMessage, cluster, cluster)
+		"%s login %s\n"
+	cmdPath := filepath.ToSlash(os.Args[0])
+	return CodedErrorf(CodeReauthRequired, reauthMessage, cluster, cmdPath, cluster)
 }