Delete pip install support script & use a manual tag for update dockerfile.

Author: d1jang

Dockerfile

@@ -521,14 +521,4 @@ ENV PYTHONUSERBASE "/root/.local"
 ADD patches/sitecustomize.py /root/.local/lib/python3.6/site-packages/sitecustomize.py
 
 # Set backend for matplotlib
-ENV MPLBACKEND "agg"
-
-# Set up an initialization script to be executed before any other commands initiated by the user.
-ADD patches/entrypoint.sh /root/entrypoint.sh
-RUN chmod +x /root/entrypoint.sh
-# NOTE: ENTRYPOINT set by "FROM <image>" should preceed the our own custom entrypoint.
-# Currently tini is set as ENTRYPOINT for the base image, and it can be combined with our entrypoint (https://github.com/krallin/tini).
-# ENTRYPOINT gets executed by "docker run <image> <command>" and it runs <command> at the end of its execution.
-# Make sure tini exists.
-RUN /usr/bin/tini -h > /dev/null
-ENTRYPOINT ["/usr/bin/tini", "--", "/root/entrypoint.sh"]
+ENV MPLBACKEND "agg"

kaggle_tools_update.Dockerfile

@@ -9,23 +9,12 @@
 # is enabled.
 
 # Usage:
-#   docker rmi gcr.io/kaggle-images/python:latest
+#   docker rmi gcr.io/kaggle-images/python:pinned
 #   docker build --rm -t kaggle/python-build -f kaggle_tools_update.Dockerfile .
 #   ./test
 #   ./push (if tests are passing)
 
-FROM gcr.io/kaggle-images/python:latest
+# Pull the last build manually tagged as "pinned". 
+FROM gcr.io/kaggle-images/python:pinned
 
-RUN pip install --upgrade git+https://github.com/Kaggle/learntools
-
-# TODO(dsjang): Remove these lines once the docker image build turns green since they are copied from Dockerfile
-# to apply on top of the last green.
-# Set up an initialization script to be executed before any other commands initiated by the user.
-ADD patches/entrypoint.sh /root/entrypoint.sh
-RUN chmod +x /root/entrypoint.sh
-# NOTE: ENTRYPOINT set by "FROM <image>" should preceed the our own custom entrypoint.
-# Currently tini is set as ENTRYPOINT for the base image, and it can be combined with our entrypoint (https://github.com/krallin/tini).
-# ENTRYPOINT gets executed by "docker run <image> <command>" and it runs <command> at the end of its execution.
-# Make sure tini exists.
-RUN /usr/bin/tini -h > /dev/null
-ENTRYPOINT ["/usr/bin/tini", "--", "/root/entrypoint.sh"]
+RUN pip install --upgrade git+https://github.com/Kaggle/learntools