Added zip to Dockerfile package installs

Author: inclement

Dockerfile

@@ -48,7 +48,7 @@ RUN apt update -qq && apt install -qq --yes --no-install-recommends \
 RUN dpkg --add-architecture i386 &&  apt update -qq && apt install -qq --yes --no-install-recommends \
 	build-essential ccache git libncurses5:i386 libstdc++6:i386 libgtk2.0-0:i386 \
 	libpangox-1.0-0:i386 libpangoxft-1.0-0:i386 libidn11:i386 python2.7 python2.7-dev \
-	openjdk-8-jdk unzip zlib1g-dev zlib1g:i386 && \
+	openjdk-8-jdk zip unzip zlib1g-dev zlib1g:i386 && \
     rm -rf /var/lib/apt/lists/*
 
 # download and install Android NDK