Add missing PhpRedis option (#570)

docker-compose.yml

@@ -52,6 +52,7 @@ services:
                 - INSTALL_MONGO=false
                 - INSTALL_ZIP_ARCHIVE=false
                 - INSTALL_BCMATH=false
+                - INSTALL_PHPREDIS=false
                 - INSTALL_MEMCACHED=false
                 - INSTALL_OPCACHE=false
                 - INSTALL_EXIF=false