fix: add scripts, update for slim, better naming

add 'build.sh' and 'test.sh' utility scripts
use 'update' before 'install' in slim images
use <purpose>.Dockerfile form for naming

README.md

@@ -1,6 +1,6 @@
 # Docker Goof
 
-Open a terminal and open the `docker-goof` directory.
+Open a terminal at the `docker-goof` directory.
 
 1. Build the image
 
@@ -23,6 +23,20 @@ docker build -t docker-goof . && \
 snyk test --docker docker-goof --file=Dockerfile
 ```
 
+## Utility scripts
+
+To build all images:
+
+   ```console
+   ./build.sh
+   ```
+
+To test all images:
+
+   ```console
+   ./test.sh
+   ```
+
 ## Screenshots
 
 All of these screenshots demonstrate the extra value provided when a

build.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+pushd "$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )" >/dev/null
+
+for f in $(ls *Dockerfile); do
+  base=$(basename ${f})
+  flavour=${base%.Dockerfile}
+  flavour=${flavour%Dockerfile}
+  tag=docker-goof${flavour:+-$flavour}
+  file=${flavour:+-f $base}
+  echo Building ${tag}...
+  docker build -q -t ${tag} . ${file}
+done
+
+popd >/dev/null

n6-slim-fw.Dockerfile

@@ -0,0 +1,5 @@
+FROM node:6.14.1-slim
+
+RUN apt-get update
+RUN apt-get install -y firewalld beep
+RUN apt-get install -y imagemagick

n6-slim.Dockerfile

@@ -0,0 +1,4 @@
+FROM node:6.14.2-slim
+
+RUN apt-get update -y
+RUN apt-get install -y imagemagick

Dockerfile-node-slim → slim.Dockerfile

@@ -1,3 +1,4 @@
 FROM node:10.4.0-slim
 
+RUN apt-get update
 RUN apt-get install -y imagemagick

test.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+pushd "$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )" >/dev/null
+
+for f in $(ls *Dockerfile); do
+  base=$(basename ${f})
+  flavour=${base%.Dockerfile}
+  flavour=${flavour%Dockerfile}
+  tag=docker-goof${flavour:+-$flavour}
+  echo Testing ${tag}...
+  snyk test --docker ${tag} --file=${base}
+done
+
+popd >/dev/null

Dockerfile-wp → wp.Dockerfile

@@ -1,3 +1,4 @@
 FROM wordpress:5
 
+RUN apt-get update
 RUN apt-get install -y imagemagick