fix(command,package): correctly set modtime on zipped files

cmd/cli/command/app/package.go

@@ -125,23 +125,34 @@ func copyDir(writer *zip.Writer, baseDir string, zipBasePath string) error {
 }
 
 func copyFile(writer *zip.Writer, srcPath string, zipPath string) error {
-	r, err := os.Open(srcPath)
+	srcFile, err := os.Open(srcPath)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+
+	srcStat, err := os.Stat(srcPath)
 	if err != nil {
 		return errors.WithStack(err)
 	}
 
 	defer func() {
-		if err := r.Close(); err != nil {
+		if err := srcFile.Close(); err != nil {
 			panic(errors.WithStack(err))
 		}
 	}()
 
-	f, err := writer.Create(zipPath)
+	fileHeader := &zip.FileHeader{
+		Name:     zipPath,
+		Modified: srcStat.ModTime().UTC(),
+		Method:   zip.Deflate,
+	}
+
+	file, err := writer.CreateHeader(fileHeader)
 	if err != nil {
 		return errors.WithStack(err)
 	}
 
-	if _, err = io.Copy(f, r); err != nil {
+	if _, err = io.Copy(file, srcFile); err != nil {
 		return errors.WithStack(err)
 	}