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# Use the official PostgreSQL image as the base image
FROM postgres:13
# Set the environment variables for the PostgreSQL database
ENV POSTGRES_DB=mydb
ENV POSTGRES_USER=myuser
ENV POSTGRES_PASSWORD=mypassword
# Check if the postgres user and group exist, and create them if not
RUN if ! id -g postgres > /dev/null 2>&1; then groupadd -r postgres; fi
RUN if ! id -u postgres > /dev/null 2>&1; then useradd -r -g postgres postgres; fi
# Set the ownership of the data directory
RUN mkdir -p /var/lib/postgresql/data && chown -R postgres:postgres /var/lib/postgresql/data
# Copy the init.sql file to the container
COPY init.sql /docker-entrypoint-initdb.d/
# Expose the default PostgreSQL port
EXPOSE 5432
# Run the PostgreSQL process as the custom user
USER postgres
# Start the PostgreSQL server when the container is launched
CMD ["postgres"]
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