Implement an Event mangement system for Silverstripe CMS

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  ci:
+    name: CI
+    uses: silverstripe/gha-ci/.github/workflows/ci.yml@v1
+    with:
+      dynamic_matrix: false
+      extra_jobs: |
+        - php: '8.1'
+          db: mysql80
+          phpunit: true
+          installer_version: ^4
+        - php: '8.2'
+          db: mysql80
+          phpunit: true
+          installer_version: ^5
+        - php: '8.3'
+          db: mariadb
+          phpunit: true
+          installer_version: ^5
+
+  coding-standards:
+    name: Coding Standards
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.1'
+          coverage: none
+          tools: composer:v2, php-cs-fixer
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress
+
+      - name: Check coding standards
+        run: php-cs-fixer fix --dry-run --diff
+
+      - name: Static Analysis
+        run: vendor/bin/phpstan analyse

.gitignore

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+/vendor/
+.phpunit.result.cache
+.php-cs-cache
+.env
+.idea/
+.vscode/
+*.swp
+*.swo
+.DS_Store 
+composer.lock
+/public/
+.php-cs-fixer.cache
+phpstan.cache/

.php-cs-fixer.dist.php

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+<?php
+
+$finder = PhpCsFixer\Finder::create()
+    ->in([
+        __DIR__ . '/src',
+        __DIR__ . '/tests',
+    ])
+    ->name('*.php')
+    ->ignoreDotFiles(true)
+    ->ignoreVCS(true);
+
+$config = new PhpCsFixer\Config();
+
+return $config
+    ->setRules([
+        '@PSR12' => true,
+        'array_syntax' => ['syntax' => 'short'],
+        'ordered_imports' => ['sort_algorithm' => 'alpha'],
+        'no_unused_imports' => true,
+        'trailing_comma_in_multiline' => true,
+        'phpdoc_align' => true,
+        'phpdoc_order' => true,
+        'phpdoc_separation' => true,
+        'phpdoc_single_line_var_spacing' => true,
+        'phpdoc_trim' => true,
+        'phpdoc_var_without_name' => true,
+        'return_type_declaration' => ['space_before' => 'none'],
+        'single_quote' => true,
+        'ternary_operator_spaces' => true,
+        'unary_operator_spaces' => true,
+    ])
+    ->setFinder($finder);