Update osxcross image to ubuntu 18.04

Author: ismith

osxcross/Dockerfile.osxcross

@@ -1,7 +1,7 @@
 # This is an image used to compile and test Dark. Later, we will use this to
 # create another dockerfile to deploy.
 
-FROM ubuntu:17.10
+FROM ubuntu:18.04
 
 ENV FORCE_BUILD 1
 
@@ -18,7 +18,8 @@ RUN DEBIAN_FRONTEND=noninteractive \
       curl \
       apt-transport-https \
       ca-certificates \
-      lsb-core
+      lsb-core \
+      gnupg
 
 # Latest NPM (taken from  https://deb.nodesource.com/setup_8.x )
 RUN curl -sSL https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -
@@ -54,50 +55,27 @@ RUN DEBIAN_FRONTEND=noninteractive \
     apt install \
       --no-install-recommends \
       -y \
-      software-properties-common=0.96.24.17 \
-      python3.6=3.6.3-1ubuntu1 \
-      make=4.1-9.1 \
-      m4=1.4.18-1 \
-      rsync=3.1.2-2ubuntu0.2 \
-      git=1:2.14.1-1ubuntu4 \
-      wget=1.19.1-3ubuntu1.2 \
-      sudo=1.8.20p2-1ubuntu1 \
-      locales=2.26-0ubuntu2.1 \
-      expect=5.45-8 \
+      make \
+      m4 \
+      rsync \
+      git \
+      wget \
+      sudo \
+      locales \
+      expect \
       tcl8.6 \
-      libev-dev=1:4.22-1 \
-      libgmp-dev=2:6.1.2+dfsg-1 \
-      pkg-config=0.29.1-0ubuntu2 \
+      libgmp-dev \
+      pkg-config \
       libcurl4-gnutls-dev \
-      python-software-properties=0.96.24.17 \
-      libpq-dev=9.6.9-0ubuntu0.17.10 \
-      postgresql-9.6=9.6.9-0ubuntu0.17.10 \
-      postgresql-client-9.6=9.6.9-0ubuntu0.17.10 \
-      postgresql-contrib-9.6=9.6.9-0ubuntu0.17.10 \
-      chromium-browser \
-      firefox \
-      gnupg \
-      nodejs \
-      google-chrome-stable \
-      dnsmasq \
-      cron \
       google-cloud-sdk \
       jq \
       vim \
       dnsutils \
-      docker-ce \
       unzip \
       build-essential \
       ruby \
       kubectl \
-      python3-pip \
-      libsodium-dev \
       gcc \
-      python-dev \
-      python-setuptools \
-      pgcli \
-      xvfb \
-      ffmpeg \
       tmux \
       && apt clean \
       && rm -rf /var/lib/apt/lists/*