Add PostgreSQL 18 workflow to CI configuration (#57232)

Author: JurianArie

.github/workflows/databases.yml

@@ -147,6 +147,55 @@ jobs:
         env:
           DB_CONNECTION: mariadb
 
+  pgsql_18:
+    runs-on: ubuntu-24.04
+    timeout-minutes: 5
+
+    services:
+      postgresql:
+        image: postgres:18
+        env:
+          POSTGRES_DB: laravel
+          POSTGRES_USER: forge
+          POSTGRES_PASSWORD: password
+        ports:
+          - 5432:5432
+        options: --health-cmd=pg_isready --health-interval=10s --health-timeout=5s --health-retries=3
+
+    strategy:
+      fail-fast: true
+
+    name: PostgreSQL 18
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.3
+          extensions: dom, curl, libxml, mbstring, zip, pcntl, pdo, pdo_pgsql, :php-psr
+          tools: composer:v2
+          coverage: none
+
+      - name: Set Framework version
+        run: composer config version "12.x-dev"
+
+      - name: Install dependencies
+        uses: nick-fields/retry@v3
+        with:
+          timeout_minutes: 5
+          max_attempts: 5
+          command: composer update --prefer-stable --prefer-dist --no-interaction --no-progress
+
+      - name: Execute tests
+        run: vendor/bin/phpunit tests/Integration/Database
+        env:
+          DB_CONNECTION: pgsql
+          DB_USERNAME: forge
+          DB_PASSWORD: password
+
   pgsql_14:
     runs-on: ubuntu-24.04
     timeout-minutes: 5