fixed issue with windows using bash script

internal/docker/errors/errors.go

@@ -0,0 +1,26 @@
+// Copyright 2019 Drone.IO Inc. All rights reserved.
+// Use of this source code is governed by the Polyform License
+// that can be found in the LICENSE file.
+
+package errors
+
+import (
+	"errors"
+	"strings"
+)
+
+// TrimExtraInfo is a helper function that trims extra information
+// from a Docker error. Specifically, on Windows, this can expose
+// environment variables and other sensitive data.
+func TrimExtraInfo(err error) error {
+	s := err.Error()
+	i := strings.Index(s, "extra info:")
+	if i > 0 {
+		s = s[:i]
+		s = strings.TrimSpace(s)
+		s = strings.TrimSuffix(s, "(0x2)")
+		s = strings.TrimSpace(s)
+		return errors.New(s)
+	}
+	return err
+}