feature #1169 PHP 8 Prototype (derrabus)

This PR was squashed before being merged into the main branch.

Discussion
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PHP 8 Prototype

I have updated the demo application to showcase the new possibilities with php 8 and Symfony 5.2. These changes are of course too bleeding edge to merge, but you might get a good first impression about how a Symfony app on php 8 might look like.

Commits
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3352393 PHP 8 Prototype

Author: javiereguiluz

.github/workflows/lint.yaml

@@ -27,7 +27,7 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                php-version: ['7.4']
+                php-version: ['8.0']
 
         steps:
             - name: "Checkout code"

.github/workflows/tests.yaml

@@ -25,13 +25,8 @@ jobs:
 
         strategy:
             matrix:
-                operating-system: ['ubuntu-latest']
-                php-version: ['7.3', '7.4', '8.0']
-                include:
-                    - operating-system: 'macos-latest'
-                      php-version: '8.0'
-                    - operating-system: 'windows-latest'
-                      php-version: '8.0'
+                operating-system: ['ubuntu-latest', 'windows-latest', 'macos-latest']
+                php-version: ['8.0']
 
         steps:
             - name: "Checkout code"

.gitignore

@@ -1,6 +1,8 @@
 /public/build/fonts/glyphicons-*
 /public/build/images/glyphicons-*
 
+.php-version
+
 ###> symfony/framework-bundle ###
 /.env.local
 /.env.local.php

composer.json

@@ -10,7 +10,7 @@
         "symfony/polyfill-php73": "*"
     },
     "require": {
-        "php": "^7.3 || ^8.0",
+        "php": ">=8.0.2",
         "ext-pdo_sqlite": "*",
         "composer/package-versions-deprecated": "^1.8",
         "doctrine/dbal": "^3.1",
@@ -57,7 +57,7 @@
     },
     "config": {
         "platform": {
-            "php": "7.3"
+            "php": "8.0.3"
         },
         "preferred-install": {
             "*": "dist"