add minimal docker files for backend and database

backend/backend.dockerfile

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+FROM python:3.9
+
+WORKDIR /code
+
+COPY ./requirements.txt /code/requirements.txt
+
+RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
+
+COPY ./app /code/app
+
+COPY ./app /app
+ENV PYTHONPATH=/app
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "80"]

backend/database.dockerfile

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+FROM postgres:15
+
+COPY ./scripts/create-db.sh /docker-entrypoint-initdb.d/

backend/scripts/create-db.sh

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+#!/bin/bash
+set -e
+
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+	CREATE DATABASE ocgpt_backend;
+EOSQL