I use the default prompt template which is defined in the tokenizer.config https://huggingface.co/deepseek-ai/deepseek-coder-33b-instru...

No special flags or anything, just the standard format. Do take care of the spaces and end of lines. sharing a gist of the function I use for formatting it: https://gist.github.com/theskcd/a3948d4062ed8d3e697121cabd65... (hope this helps!)