Fix missed git binary to clone non-relesed dependency from master

Author: sibprogrammer

Dockerfile

@@ -1,6 +1,6 @@
 FROM php:7.3-cli
 
 RUN apt-get update \
-    && apt-get install -y unzip \
+    && apt-get install -y unzip git \
     && docker-php-ext-install pcntl \
     && curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer