docker

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Looks like I am too stupid to create the most simple Docker. Maybe you can help me somehow?

I would just like to run it to have a look

FROM node:20-bookworm

WORKDIR /app

COPY . .

RUN npm install

EXPOSE 3000
EXPOSE 80

CMD ["npm", "run", "tina"]

I run it with -p "80:80" -p "3000:3000" but nothing happens at localhost:3000, why is that?