純正のイメージはあまりよくなさそうなので
FROM python:2
ENV PATH=$PATH:/root/google-cloud-sdk/bin: \
PYTHONPATH=$PYTHONPATH:/usr/src/myProjPath
EXPOSE 5000 8000
RUN curl https://sdk.cloud.google.com > install.sh && \
bash install.sh --disable-prompts && \
gcloud components install app-engine-python && \
gcloud components install app-engine-python-extras && \
pip install -U pip && \
pip install google-cloud-storage && \
pip install boto3 && \
pip install tqdm && \
pip install Flask && \
pip install flask_paginate