feat: add supervisor

Author: josu-gomez

Dockerfile

@@ -25,6 +25,7 @@ RUN apt-get update && apt-get install --no-install-recommends -y \
     wkhtmltopdf \
     libpq-dev \
     librabbitmq-dev \
+    supervisor \
     && curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer \
     && docker-php-ext-install iconv pdo_mysql pdo_pgsql mbstring gettext exif intl zip opcache bcmath xml soap \
     && docker-php-ext-configure gd --with-freetype --with-jpeg \