Add Dockerfile

Dockerfile

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+# `python-base` sets up all our shared environment variables
+FROM python:3.11-slim as python-base
+
+    # python
+ENV PYTHONUNBUFFERED=1 \
+    # prevents python creating .pyc files
+    PYTHONDONTWRITEBYTECODE=1 \
+    \
+    # pip
+    PIP_NO_CACHE_DIR=off \
+    PIP_DISABLE_PIP_VERSION_CHECK=on \
+    PIP_DEFAULT_TIMEOUT=100 \
+    \
+    # poetry
+    # https://python-poetry.org/docs/configuration/#using-environment-variables
+    # make poetry install to this location
+    POETRY_HOME="/opt/poetry" \
+    # make poetry create the virtual environment in the project's root
+    # it gets named `.venv`
+    POETRY_VIRTUALENVS_IN_PROJECT=true \
+    # do not ask any interactive question
+    POETRY_NO_INTERACTION=1 \
+    \
+    # paths
+    # this is where our requirements + virtual environment will live
+    PYSETUP_PATH="/opt/pysetup" \
+    VENV_PATH="/opt/pysetup/.venv"
+
+
+# prepend poetry and venv to path
+ENV PATH="$POETRY_HOME/bin:$VENV_PATH/bin:$PATH"
+
+
+# `builder-base` stage is used to build deps + create our virtual environment
+FROM python-base as builder-base
+RUN apt-get update \
+    && apt-get install --no-install-recommends -y \
+        # deps for installing poetry
+        curl \
+        # deps for building python deps
+        build-essential
+
+# install poetry - respects $POETRY_VERSION & $POETRY_HOME
+RUN curl -sSL https://install.python-poetry.org | python3 -
+
+# copy project requirement files here to ensure they will be cached.
+WORKDIR $PYSETUP_PATH
+COPY poetry.lock pyproject.toml ./
+
+# install runtime deps - uses $POETRY_VIRTUALENVS_IN_PROJECT internally
+RUN poetry install --no-dev
+
+# `production` image used for runtime
+FROM python-base as production
+ENV FASTAPI_ENV=production
+COPY --from=builder-base $PYSETUP_PATH $PYSETUP_PATH
+COPY alembic.ini /usr/src/
+COPY ./alembic /usr/src/alembic
+COPY ./app /usr/src/app
+WORKDIR /usr/src
+CMD ["gunicorn", "-k", "uvicorn.workers.UvicornWorker", "--bind", "0.0.0.0:8000", "app.main:app"]