From 04af2a25d26c72969e4fcb27c75201c3dbfcdf34 Mon Sep 17 00:00:00 2001
From: Peter Dave Hello <hsu@peterdavehello.org>
Date: Mon, 18 Mar 2019 15:40:25 +0800
Subject: [PATCH] Remove `apt-get clean` in Dockerfile.{jetty,tomcat}

Also manually cleaned up `/var/lib/apt/lists` in original commits but
got conflict with #97, then removed.

Ref:
https://docs.docker.com/develop/develop-images/dockerfile_best-practices/

> In addition, when you clean up the apt cache by removing
> /var/lib/apt/lists it reduces the image size, since the apt cache is not
> stored in a layer.

> Official Debian and Ubuntu images automatically run apt-get clean,
> so explicit invocation is not required.
---
 Dockerfile.jetty  | 2 +-
 Dockerfile.tomcat | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Dockerfile.jetty b/Dockerfile.jetty
index f2f882fd..cfc70439 100644
--- a/Dockerfile.jetty
+++ b/Dockerfile.jetty
@@ -15,7 +15,7 @@ USER root
 
 RUN apt-get update && \
     apt-get install -y --no-install-recommends graphviz fonts-noto-cjk && \
-    apt-get clean && rm -rf /var/lib/apt/lists/*
+    rm -rf /var/lib/apt/lists/*
 
 USER jetty
 
diff --git a/Dockerfile.tomcat b/Dockerfile.tomcat
index 255c9d00..a816a3cf 100644
--- a/Dockerfile.tomcat
+++ b/Dockerfile.tomcat
@@ -28,7 +28,7 @@ MAINTAINER D.Ducatel
 
 RUN apt-get update && \
     apt-get install -y --no-install-recommends fonts-noto-cjk libexpat1 libcairo2 libpango1.0 libpangoft2-1.0 libpangocairo-1.0 && \
-    apt-get clean && rm -rf /var/lib/apt/lists/*
+    rm -rf /var/lib/apt/lists/*
 
 ENV GRAPHVIZ_DOT=/usr/bin/dot