Ensure that package managers clean up

Every package manager should clean up after themselves in order to keep
docker layers neat and tiny:

apt (Debian/Ubuntu package manager):

 - unneeded dependencies are cleared (autoremove)
 - caches are cleaned (clean)
 - package lists are deleted

yum (CentOS package manager),
zypper (OpenSuse package manager)

 - should clear caches after installing dependencies

pip (Python package manager),
apk (Alpine package manager)

 - should use no cache for installing dependencies

scripts/install-ansible

@@ -6,7 +6,10 @@ ANSIBLE_VERSION=$1
 
 apt-get update
 apt-get install -y python-pip python-dev
-apt-get clean -yqq
 
-pip install --upgrade cffi
-pip install "ansible==${ANSIBLE_VERSION}"
+pip install --no-cache-dir --upgrade cffi
+pip install --no-cache-dir "ansible==${ANSIBLE_VERSION}"
+
+apt-get autoremove -yq
+apt-get clean -yqq
+rm -rf /var/lib/apt/lists/*

scripts/install-chrome

@@ -35,3 +35,7 @@ rm -rf /var/lib/apt/lists/*
 wget -q https://chromedriver.storage.googleapis.com/$CHROME_DRIVER_VERSION/chromedriver_linux64.zip
 unzip chromedriver_linux64.zip -d /usr/local/bin
 rm -f chromedriver_linux64.zip
+
+apt-get autoremove -yq
+apt-get clean -yqq
+rm -rf /var/lib/apt/lists/*

scripts/install-essentials

@@ -16,8 +16,6 @@ apt-get install -y \
 	libkrb5-dev postgresql-client mysql-client unzip \
 	libre2-dev gettext \
 
-apt-get clean -yqq
-
 # Set UTF-8
 # http://stackoverflow.com/a/3182519/2137281
 LOC=$'LC_ALL=en_US.UTF-8\nLANG=en_US.UTF-8'
@@ -28,4 +26,6 @@ locale-gen
 dpkg-reconfigure locales -f noninteractive -p critical
 locale -a
 
+apt-get autoremove -yq
+apt-get clean -yqq
 rm -rf /var/lib/apt/lists/*

scripts/install-node

@@ -15,3 +15,7 @@ echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.lis
 
 apt-get update
 apt-get install -y nodejs yarn=$YARN_INSTALL_VERSION
+
+apt-get autoremove -yq
+apt-get clean -yqq
+rm -rf /var/lib/apt/lists/*

scripts/install-postgresql

@@ -10,4 +10,7 @@ echo "deb http://apt.postgresql.org/pub/repos/apt/ xenial-pgdg ${POSTGRES_VERSIO
 
 apt-get update
 apt-get install -y postgresql-client
+
 apt-get autoremove -yq
+apt-get clean -yqq
+rm -rf /var/lib/apt/lists/*

scripts/install-www-gitlab-com

@@ -11,7 +11,6 @@ apt-get install -yq --no-install-recommends \
   git-core pandoc texlive-latex-recommended texlive-xetex \
   texlive-fonts-recommended lmodern ed file curl gnupg2
 
-apt-get autoremove -yq
 
 # Set UTF-8
 echo "en_US.UTF-8 UTF-8" > /etc/locale.gen
@@ -19,4 +18,6 @@ locale-gen
 update-locale LANG=en_US.UTF-8 LC_CTYPE=en_US.UTF-8 LC_ALL=en_US.UTF-8
 locale -a
 
+apt-get autoremove -yq
+apt-get clean -yqq
 rm -rf /var/lib/apt/lists/*