refactor(context): Added an optional permission parameter to the SaveUploadedFile method (#4068)

[haesuo566]

The SaveUploadedFile method previously set folder permissions to 0o750 by default when creating directories. A third parameter, ...fs.FileMode, has been added to allow customizable permissions. This update enables users to optionally set folder permissions when creating directories and files with the SaveUploadedFile method.

func SaveFile(ctx *gin.Context) error {
	file, err := ctx.FormFile("file")
	if err != nil {
		return err
	}

	var perm fs.FileMode = 0o755
	return ctx.SaveUploadedFile(file, "/asset/file", perm)
}

[appleboy]

@haesuo566 test error.

[haesuo566]

@appleboy I’ve committed the fix for the issue where the permissions weren’t being set correctly due to the umask, which was causing the test to fail. Please review it.

[appleboy]

@haesuo566 still failed in lint testing.