fixed issue with windows using bash script

internal/docker/errors/errors_test.go

@@ -0,0 +1,22 @@
+// 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"
+	"testing"
+)
+
+func TestTrimExtraInfo(t *testing.T) {
+	const (
+		before = `Error response from daemon: container encountered an error during CreateProcess: failure in a Windows system call: The system cannot find the file specified. (0x2) extra info: { "User":"ContainerUser" }`
+		after  = `Error response from daemon: container encountered an error during CreateProcess: failure in a Windows system call: The system cannot find the file specified.`
+	)
+	errBefore := errors.New(before)
+	errAfter := TrimExtraInfo(errBefore)
+	if errAfter.Error() != after {
+		t.Errorf("Expect trimmed image")
+	}
+}