Run artisan inside container instead of on host (PHP version mismatch)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -55,12 +55,5 @@ jobs:
           script: |
             set -e
             cd ~/app
-
-            # Composer auf dem Host installieren falls nicht vorhanden
-            if [ ! -f "$HOME/composer.phar" ]; then
-              curl -sS https://getcomposer.org/installer | php -- --install-dir="$HOME" --filename=composer.phar
-            fi
-            php "$HOME/composer.phar" install --no-dev --optimize-autoloader
-
             docker compose up -d --build --remove-orphans
             docker compose exec -T app php artisan migrate --force