fix(build): add ubuntu 32-bit docker build

docker/ubuntu32/Dockerfile

@@ -0,0 +1,34 @@
+# VERSION:        0.1
+# DESCRIPTION:    Image to build N1 and create a .deb and .rpm file for 32-bit systems, derived from Atom's Dockerfile
+
+# Base docker image
+FROM 32bit/ubuntu:14.04
+
+# Force noninteractive mode
+ENV DEBIAN_FRONTEND noninteractive
+
+# Setup NodeSource repository for Node LTS v4.x
+RUN apt-get update && apt-get install -y curl
+RUN curl -sL https://deb.nodesource.com/setup_4.x | bash -
+
+# Correct errors with libpam-systemd (indirect dependency of libnotify4)
+RUN /bin/ln -sf /bin/true /sbin/initctl
+RUN /usr/bin/touch /etc/init.d/systemd-logind
+
+# Install dependencies (NodeSource setup runs `apt-get update` for us)
+RUN apt-get -y install \
+    build-essential \
+    git \
+    fakeroot \
+    libgconf2-4 \
+    libgnome-keyring-dev \
+    libgtk2.0-0 \
+    libnotify4 \
+    rpm \
+    nodejs \
+    xvfb
+
+#RUN npm install -g npm@3.3.10 --loglevel error
+
+ADD . /n1
+WORKDIR /n1

script/cibuild-n1-ubuntu32

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -e
+
+# --rm \
+docker build -t n1-32 -f ./docker/ubuntu32/Dockerfile .
+docker run \
+ --env="CI=true" \
+ --volume="$HOME"/.npm:/root/.npm \
+ --volume="$HOME"/.nylas/.apm:/root/.nylas/.apm \
+ --volume="$HOME"/.nylas/electron:/root/.nylas/electron \
+ n1-32 /usr/bin/linux32 /n1/script/cibuild
+docker rmi n1-32