Support docker (#14)

chore: add Dockerfile (#13, #14)

Co-authored-by: Queensferry <queensferry.me@gmail.com>

.dockerignore

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+**/__pycache__/

Dockerfile

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+FROM python:3.9-alpine
+
+# Setup
+RUN addgroup -S app && adduser -S app -G app
+RUN apk add --no-cache curl
+USER app
+
+# Copy
+ENV HOME=/home/app
+WORKDIR $HOME/app
+COPY --chown=app:app rsserpent rsserpent
+COPY --chown=app:app poetry.lock pyproject.toml .
+
+# Dependencies
+RUN curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python -
+ENV PATH="${HOME}/.local/bin:${HOME}/.poetry/bin:${PATH}"
+RUN poetry config virtualenvs.create false && \
+    poetry add --lock uvicorn && \
+    poetry install --no-dev
+
+# Cleanup
+USER root
+RUN apk del curl
+RUN yes | poetry cache clear --all .
+USER app
+
+# Run
+EXPOSE 8000
+CMD [ "uvicorn", "rsserpent:app", "--host", "0.0.0.0" ]