Fix:Issue #2038 Install mongodb php extension (#2167)

* Fix:Issue #2038 Install mongodb php extension
- Make sure `INSTALL_MONGO` flag is `true`
- Run pecl install mongodb and enable the extentions in `laravel-horizon`
  and `php-worker` images
- Remember to rebuild images
* INSTALL flag default set false

laravel-horizon/Dockerfile

@@ -24,7 +24,7 @@ RUN apk --update add wget \
   procps
 
 RUN docker-php-ext-install mysqli mbstring pdo pdo_mysql tokenizer xml pcntl
-RUN pecl channel-update pecl.php.net && pecl install memcached mcrypt-1.0.1 && docker-php-ext-enable memcached
+RUN pecl channel-update pecl.php.net && pecl install memcached mcrypt-1.0.1 mongodb && docker-php-ext-enable memcached mongodb
 
 #Install BCMath package:
 ARG INSTALL_BCMATH=false

php-worker/Dockerfile

@@ -24,7 +24,7 @@ RUN apk --update add wget \
   supervisor
 
 RUN docker-php-ext-install mysqli mbstring pdo pdo_mysql tokenizer xml pcntl
-RUN pecl channel-update pecl.php.net && pecl install memcached mcrypt-1.0.1 && docker-php-ext-enable memcached
+RUN pecl channel-update pecl.php.net && pecl install memcached mcrypt-1.0.1 mongodb && docker-php-ext-enable memcached mongodb
 
 # Add a non-root user:
 ARG PUID=1000