added zip to php-fpm workspace container (so there is no composer warning) (#1903)

workspace/Dockerfile

@@ -53,6 +53,13 @@ RUN apt-get update -yqq && \
 # to add more Software's or remove existing one, you need to edit the
 # base image (https://github.com/Laradock/workspace).
 #
+# next lines are here becase there is no auto build on dockerhub see https://github.com/laradock/laradock/pull/1903#issuecomment-463142846
+USER root
+
+RUN apt-get install libzip-dev zip unzip -y && \
+    docker-php-ext-configure zip --with-libzip && \
+    # Install the zip extension
+    docker-php-ext-install zip \
 
 #
 #--------------------------------------------------------------------------