Remove unnecessary build step

Author: nolanpro

Dockerfile

@@ -1,10 +1,5 @@
 FROM guligo/jdk-maven-ant
 MAINTAINER ProcessMaker Inc.
 
-# https://superuser.com/questions/1423486
-RUN printf "deb http://archive.debian.org/debian/ jessie main\ndeb-src http://archive.debian.org/debian/ jessie main\ndeb http://security.debian.org jessie/updates main\ndeb-src http://security.debian.org jessie/updates main" > /etc/apt/sources.list
-RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys AA8E81B4331F7F50
-RUN apt-get update && apt-get install -y git-core
-
 COPY /src /opt/executor
 WORKDIR /opt/executor