Enhance CI workflow by adding PHP setup step and caching for vendor directory

.github/workflows/ci.yml

@@ -34,6 +34,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup PHP
+        id: setup-php
         uses: shivammathur/setup-php@v2
         with:
           php-version: '8.2'
@@ -55,8 +56,20 @@ jobs:
           restore-keys: |
             composer-${{ runner.os }}-
 
+      - name: Cache vendor directory
+        id: cache-vendor
+        uses: actions/cache@v4
+        with:
+          path: vendor
+          key: vendor-${{ runner.os }}-${{ steps.setup-php.outputs.php-version }}-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            vendor-${{ runner.os }}-${{ steps.setup-php.outputs.php-version }}-
+
       - name: Install Composer dependencies
         run: composer install --prefer-dist --no-interaction --no-progress
+        env:
+          COMPOSER_NO_INTERACTION: 1
+          COMPOSER_MEMORY_LIMIT: -1
 
       - name: Prepare SQLite database
         run: |