Add docker for 18.04 ubuntu

Dockerfile_18.04

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+#
+# Minimum Docker image to build Android AOSP
+#
+FROM ubuntu:18.04
+ARG USER_ID=1001
+ARG GROUP_ID=1001
+
+# Keep the dependency list as short as reasonable
+RUN apt-get update && \
+    apt-get install -y bc bison bsdmainutils build-essential curl \
+        flex g++-multilib gcc-multilib git gnupg gperf lib32ncurses5-dev \
+        lib32z1-dev libncurses5-dev \
+        libsdl1.2-dev libxml2-utils lzop \
+        openjdk-8-jdk \
+        genisoimage sudo \
+        gettext \
+        python-mako \
+        pngcrush schedtool xsltproc zip zlib1g-dev libswitch-perl git-core gnupg flex bison build-essential zip curl zlib1g-dev gcc-multilib g++-multilib libc6-dev-i386 libncurses5-dev lib32ncurses5-dev x11proto-core-dev libx11-dev lib32z1-dev libgl1-mesa-dev libxml2-utils xsltproc unzip fontconfig && \
+    apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+ADD https://commondatastorage.googleapis.com/git-repo-downloads/repo /usr/local/bin/
+RUN chmod 755 /usr/local/bin/*
+
+# All builds will be done by user aosp
+RUN groupadd -g ${GROUP_ID} aosp && useradd --create-home aosp -u ${USER_ID} -g ${GROUP_ID}  -s /bin/bash && echo "aosp:aosp" | chpasswd && adduser aosp sudo
+ADD gitconfig /home/aosp/.gitconfig
+ADD ssh_config /home/aosp/.ssh/config
+RUN chown aosp:aosp /home/aosp/.gitconfig
+
+# The persistent data will be in these two directories, everything else is
+# considered to be ephemeral
+VOLUME ["/tmp/ccache", "/aosp"]
+
+# Improve rebuild performance by enabling compiler cache
+ENV USE_CCACHE 1
+ENV CCACHE_DIR /tmp/ccache
+
+# Work in the build directory, repo is expected to be init'd here
+USER aosp
+WORKDIR /aosp
+
+#Relogin to set env var such as USER
+CMD sudo -E -iu aosp