minor #1012 Run tests on PHP 8.1 (derrabus, weaverryan)

This PR was merged into the 1.0-dev branch.

Discussion
----------

Run tests on PHP 8.1

Commits
-------

8e9dc74 allowing php-cs-fixer to use php 8.1
b96ef5c Attempting to allow dev deps for php 8.1
4d3af60 Run tests on PHP 8.1

Author: weaverryan

.github/workflows/ci.yaml

@@ -84,6 +84,7 @@ jobs:
 
         env:
             SYMFONY_VERSION: ${{ matrix.symfony-version }}
+            MAKER_ALLOW_DEV_DEPS_IN_APP: ${{ matrix.allow-dev-deps-in-apps }}
 
         strategy:
             fail-fast: false
@@ -96,6 +97,7 @@ jobs:
                     - '5.4.x-dev'
                     - '6.0.x-dev'
                 dependency-versions: ['highest']
+                allow-dev-deps-in-apps: ['0']
                 include:
                     # testing lowest PHP version with LTS
                     - php-version: '7.1.3'
@@ -106,6 +108,12 @@ jobs:
                     - php-version: '7.2.5'
                       symfony-version: '5.3.*'
                       dependency-versions: 'lowest'
+                    # testing bleeding edge PHP with highest 5.x stable
+                    - php-version: '8.1'
+                      symfony-version: '5.3.*'
+                      dependency-versions: 'highest'
+                      # temporarily needed until some packages support php 8.1
+                      allow-dev-deps-in-apps: '1'
 
         steps:
             - name: "Checkout code"

src/Test/MakerTestEnvironment.php

@@ -215,8 +215,11 @@ public function runPhpCSFixer(string $file): MakerTestProcess
             throw new \Exception('php-cs-fixer not found: run: "composer install --working-dir=tools/php-cs-fixer".');
         }
 
-        return MakerTestProcess::create(sprintf('php tools/php-cs-fixer/vendor/bin/php-cs-fixer --config=%s fix --dry-run --diff %s', __DIR__.'/../Resources/test/.php_cs.test', $this->path.'/'.$file), $this->rootPath)
-                               ->run(true);
+        return MakerTestProcess::create(
+            sprintf('php tools/php-cs-fixer/vendor/bin/php-cs-fixer --config=%s fix --dry-run --diff %s', __DIR__.'/../Resources/test/.php_cs.test', $this->path.'/'.$file),
+            $this->rootPath,
+            ['PHP_CS_FIXER_IGNORE_ENV' => '1']
+        )->run(true);
     }
 
     public function runTwigCSLint(string $file): MakerTestProcess
@@ -262,6 +265,11 @@ private function buildFlexSkeleton(): void
         ];
         $this->processReplacements($replacements, $this->flexPath);
 
+        if ($_SERVER['MAKER_ALLOW_DEV_DEPS_IN_APP'] ?? false) {
+            MakerTestProcess::create('composer config minimum-stability dev', $this->flexPath)->run();
+            MakerTestProcess::create('composer config prefer-stable true', $this->flexPath)->run();
+        }
+
         // fetch a few packages needed for testing
         MakerTestProcess::create('composer require phpunit browser-kit symfony/css-selector --prefer-dist --no-progress --no-suggest', $this->flexPath)
                         ->run();