[Solved] where is dockerfile and how to add lines in it?

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You create a textfile called Dockerfile in your project directory and put all your code in there.

Example:

FROM ubuntu

RUN apt-get update && apt-get install -y <your-dependencys>

COPY . .

2nd line installs packages on the image.

3rd line copys every file in your current directory to the image.

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solved where is dockerfile and how to add lines in it?