added alpine and slim base images

Author: mjhea0

{{cookiecutter.app_slug}}/Dockerfile

@@ -1,10 +1,9 @@
-FROM python:3.6.5
+FROM python:3.6.5-slim
 
-# install environment dependencies
-RUN apt-get update -yqq \
-  && apt-get install -yqq --no-install-recommends \
-    netcat \
-  && apt-get -q clean
+# install netcat
+RUN apt-get update \
+  && apt-get -y install netcat \
+  && apt-get clean
 
 # set working directory
 RUN mkdir -p /usr/src/app

{{cookiecutter.app_slug}}/project/server/db/Dockerfile

@@ -1,4 +1,4 @@
-FROM postgres
+FROM postgres:10.4-alpine
 
 # run create.sql on init
 ADD create.sql /docker-entrypoint-initdb.d

{{cookiecutter.app_slug}}/setup-with-docker.md

@@ -2,7 +2,7 @@
 
 Use this guide if you want to use Docker in your project.
 
-> Built with Docker v18.03.0-ce.
+> Built with Docker v18.03.1-ce.
 
 ## Getting Started