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This fix tries to address issues in #23221 where Dockerfile may consists of UTF-8 BOM. This likely happens when Notepad tries to save a file as UTF-8 in Windows. This fix skips the UTF-8 BOM bytes from the beginning of the Dockerfile if exists. Additional tests has been added to cover the changes in this fix. This fix fixes #23221. Signed-off-by: Yong Tang <yong.tang.github@outlook.com>