add docker support

docker/Dockerfile

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+FROM markizano/devuan:beowulf-amd64
+
+RUN apt-get update
+RUN apt-get install -y php-cli git unzip php-xml
+
+COPY get_composer.sh /root/
+RUN bash /root/get_composer.sh && rm /root/get_composer.sh
+
+RUN mkdir /app
+WORKDIR /app
+RUN composer init && composer config repositories.jhodges composer https://composer.jhodges.co.uk && composer require jhodges/sitemap
+
+COPY crawl.php /app/
+
+RUN apt clean
+
+ENTRYPOINT php crawl.php

docker/crawl.php

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+<?php
+require_once(__DIR__.'/vendor/autoload.php');
+
+use \JHodges\Sitemap\Crawler;
+
+if(!$url=getenv('CRAWL_URL')){
+	die("No env: CRAWL_URL\n");
+}
+
+$crawler=new Crawler();
+$crawler->crawl($url);
+
+foreach($crawler->getResults() as $url=>$result){
+        echo("{$result['code']} {$url}\n");
+        foreach($result['foundOn'] as $url=>$count){
+            echo("    <- ($count) $url\n");
+        }
+}

docker/get_composer.sh

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+#!/bin/sh
+
+EXPECTED_CHECKSUM="$(wget -q -O - https://composer.github.io/installer.sig)"
+php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
+ACTUAL_CHECKSUM="$(php -r "echo hash_file('sha384', 'composer-setup.php');")"
+
+if [ "$EXPECTED_CHECKSUM" != "$ACTUAL_CHECKSUM" ]
+then
+    >&2 echo 'ERROR: Invalid installer checksum'
+    rm composer-setup.php
+    exit 1
+fi
+
+php composer-setup.php --1 --filename=composer --install-dir=/usr/local/bin
+RESULT=$?
+rm composer-setup.php
+exit $RESULT