Example of multistage Docker build for grpc

Dockerfile

FROM alpine:3.6 AS base
RUN apk add --no-cache python3 ca-certificates tzdata tini \
 && apk upgrade --no-cache

FROM base AS build
RUN apk add --no-cache \
      python3-dev \
      cython \
      build-base

COPY requirements.txt /app/
RUN pip3 install --no-cache-dir --upgrade -r /app/requirements.txt

FROM base
COPY --from=build /usr/lib/python3.6/site-packages/ /usr/lib/python3.6/site-packages/

WORKDIR /app/
COPY foo.py /app/

ENTRYPOINT ["/sbin/tini", "--"]
CMD ["/usr/bin/env", "python3", "foo.py"]