chore: group PHP-related templates

templates/php/docker-entrypoint-php.twig

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+[[ -f composer.json && ! -d vendor ]] && composer install
+
+eval "$@"

templates/php/phpcs.xml.twig

@@ -0,0 +1,7 @@
+<?xml version="1.0"?>
+<ruleset name="{{ name }} coding standards">
+   <description>PHPCS configuration file for {{ name }}.</description>
+   <file>src</file>
+   <arg value="np"/>
+   <rule ref="{{ php.phpcs.standard }}"/>
+</ruleset>

templates/php/phpstan.neon.twig

@@ -0,0 +1,6 @@
+parameters:
+  level: {{ php.phpstan.level }}
+  paths:
+    {% for path in php.phpstan.paths | default(["src"]) -%}
+    - {{ path }}
+    {% endfor %}

templates/php/phpunit.xml.twig

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.5/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         cacheResultFile=".phpunit.cache/test-results"
+         executionOrder="depends,defects"
+         forceCoversAnnotation="false"
+         beStrictAboutCoversAnnotation="true"
+         beStrictAboutOutputDuringTests="false"
+         beStrictAboutTodoAnnotatedTests="true"
+         convertDeprecationsToExceptions="true"
+         failOnRisky="true"
+         failOnWarning="true"
+         verbose="true">
+    <testsuites>
+        <testsuite name="{{ name }}">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>