minor #114 Update OS version for works flows (sstok)

This PR was merged into the 1.0-dev branch.

Discussion
----------

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    |no
| Deprecations? | no
| Fixed tickets |
| License       | MIT


Commits
-------

afa5735 Update OS version for works flows

.github/workflows/ci.yaml

@@ -10,7 +10,7 @@ on:
 jobs:
     test:
         name: PHP ${{ matrix.PHP_VERSION }}
-        runs-on: ubuntu-18.04
+        runs-on: ubuntu-latest
         strategy:
             fail-fast: false
             matrix:
@@ -60,7 +60,6 @@ jobs:
                     git config --global user.email [email protected]
 
                     rm -f composer.lock
-                    composer global require symfony/flex
                     composer install --no-progress --no-interaction --optimize-autoloader --ansi
 
             ## —— Tests ✅ ———————————————————————————————————————————————————————————
@@ -92,7 +91,6 @@ jobs:
                 name: Install Composer dependencies
                 run: |
                     rm -f composer.lock
-                    composer global require symfony/flex
                     composer install --no-progress --no-interaction --no-suggest --optimize-autoloader --ansi
 
             -

composer.json

@@ -28,7 +28,8 @@
         "matthiasnoback/symfony-dependency-injection-test": "^3.1.0 || ^4.1.0",
         "symfony/console": "^3.4.22 || ^4.0 || ^5.0 || ^6.0",
         "symfony/phpunit-bridge": "^3.4.22 || ^4.0 || ^5.0 || ^6.0",
-        "symfony/var-dumper": "^3.4.22 || ^4.0 || ^5.0 || ^6.0"
+        "symfony/var-dumper": "^3.4.22 || ^4.0 || ^5.0 || ^6.0",
+        "symfony/flex": "^1.20 || ^2.3"
     },
     "repositories": [
         {"url": "https://github.com/sstok/SymfonyDependencyInjectionTest.git", "type": "git"},
@@ -53,5 +54,16 @@
         }
     },
     "minimum-stability": "dev",
-    "prefer-stable": true
+    "prefer-stable": true,
+    "config": {
+        "allow-plugins": {
+            "symfony/flex": true
+        }
+    },
+    "scripts": {
+        "auto-scripts": {
+            "cache:clear": "symfony-cmd",
+            "assets:install %PUBLIC_DIR%": "symfony-cmd"
+        }
+    }
 }