From ab8b47864804a4d8cf418cc4b6e1735d7603f967 Mon Sep 17 00:00:00 2001
From: Tianon Gravi <admwiggin@gmail.com>
Date: Wed, 29 May 2019 15:52:42 -0700
Subject: [PATCH] Improve "slides/Dockerfile" reliability/image size

This pins to a specific version of Alpine to insulate against Alpine version bumps renaming packages (or changing the way they work like when `pip` got split out into a separate package) and uses `apk add --no-cache` instead of `apk update` to create a slightly smaller end result.
---
 slides/Dockerfile | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/slides/Dockerfile b/slides/Dockerfile
index c9390edb..491b015f 100644
--- a/slides/Dockerfile
+++ b/slides/Dockerfile
@@ -1,7 +1,4 @@
-FROM alpine
-RUN apk update
-RUN apk add entr
-RUN apk add py-pip
-RUN apk add git
+FROM alpine:3.9
+RUN apk add --no-cache entr py-pip git
 COPY requirements.txt .
 RUN pip install -r requirements.txt