Add dockerfile for prod deploy

Dockerfile

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+# All directory paths for COPY commands are relative to the build context
+
+# Ensure this python version stays in sync with CI
+FROM python:3.11-slim as base
+WORKDIR /backend
+
+# set environment variables
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1
+ENV POETRY_HOME="/opt/poetry"
+ENV MYPYPATH="/app/src/stubs"
+
+# Use bash as the shell for the build
+# https://github.com/docker/for-linux/issues/408#issuecomment-414748815
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
+RUN set -eux && \
+    apt-get update && \
+    apt-get install -y \
+      build-essential \
+      curl \
+      libpq-dev \
+      python3-dev \
+      libmagic1
+
+# https://python-poetry.org/docs
+RUN pip install poetry
+
+# install deps before copying project files so the cache is only invalidated
+# when the deps change
+COPY ./backend/pyproject.toml ./backend/poetry.lock ./
+RUN poetry config virtualenvs.create false
+RUN poetry install --no-root --only main
+
+COPY ./backend .
+
+EXPOSE 8080
+
+###
+# development image
+###
+FROM base as development
+
+ENTRYPOINT ["bash", "./scripts/prod_entry_point.sh"]

backend/scripts/prod_entry_point.sh

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+# -e: fail on any nonzero exit status
+# -u: fail if any referenced variables are not set
+# -x: print commands before running them
+# -o pipefail: fail if a command in a pipe has a nonzero exit code
+set -euxo pipefail
+
+# For now just create the db if it doesn't exist
+# python -m scripts.run_migrations create
+
+uvicorn server.main:app --host 0.0.0.0 --port 8080 --reload