Create deb packages on CircleCI

docker/Dockerfile

@@ -7,6 +7,9 @@ ENV PATH=$HOME/.nodebrew/current/bin:$PATH
 USER root
 RUN apt-get update && apt-get -y install wget bzip2 zip
 
+# electron-builder
+apt-get -y install ruby ruby-dev gcc make icnsutils graphicsmagick xz-utils && gem install fpm
+
 USER xclient
 # install Node.js
 RUN curl -L git.io/nodebrew | perl - setup && nodebrew install-binary $NODE_VERSION && nodebrew use $NODE_VERSION

docker/package_in_docker.sh

@@ -3,3 +3,4 @@
 set -ex
 cd electron-mattermost
 npm run package:all
+npm run package:linux