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This project doesn't use Docker, but if you don't have Postgres installed, you can build a Docker container for it with this Dockerfile.

First build the Docker image:

docker image build -f postgres.Dockerfile -t codeselfstudy_postgres .

Then run a container from the image:

docker container run --rm \
    -p 5432:5432 \
    -v $(pwd)/pg:/var/lib/postgresql/data \
    -e POSTGRES_USER=postgres \
    -e POSTGRES_PASSWORD=postgres \
    --name codeselfstudy_postgres codeselfstudy_postgres

Django will then be able to connect to that Postgres database using the settings above. The data will be persisted in a local pg directory. Removing that directory will permanently delete the data.

If something else is already using port 5432 (like another instance of Postgres), then you can run the container on another port by changing the first 5432 in the command to something else, like 5431. Update your .env file to match your chosen port.