#24 reduce Docker image size

Dockerfile

@@ -1,12 +1,19 @@
 FROM python:3.7-alpine3.8
 
-RUN pip3 install pipenv
+WORKDIR /
 
-COPY Pipfile /
 COPY Pipfile.lock /
+COPY pipenv-install.py /
+
+RUN /pipenv-install.py && \
+    rm -fr /usr/local/lib/python3.7/site-packages/pip && \
+    rm -fr /usr/local/lib/python3.7/site-packages/setuptools
+
+FROM python:3.7-alpine3.8
 
 WORKDIR /
-RUN pipenv install --system --deploy --ignore-pipfile
+
+COPY --from=0 /usr/local/lib/python3.7/site-packages /usr/local/lib/python3.7/site-packages
 
 COPY kube_resource_report /kube_resource_report
 

pipenv-install.py

@@ -0,0 +1,15 @@
+#!/usr/bin/env python3
+"""
+Helper script for Docker build to install packages from Pipfile.lock without installing Pipenv
+"""
+import json
+import subprocess
+
+with open("Pipfile.lock") as fd:
+    data = json.load(fd)
+
+packages = []
+for k, v in data["default"].items():
+    packages.append(k + v["version"])
+
+subprocess.run(["pip3", "install"] + packages, check=True)