feat(docker): upgrade to zesty

docker/base/Dockerfile

@@ -1,4 +1,4 @@
-FROM buildpack-deps:yakkety-curl
+FROM buildpack-deps:zesty-curl
 
 # rpm is required for FPM to build rpm package
 # yasm is required to build p7zip
@@ -19,8 +19,9 @@ ENV DEBUG_COLORS true
 ENV FORCE_COLOR true
 ENV DEBIAN_FRONTEND noninteractive
 
+# locales for locale-gen
 RUN curl -L https://yarnpkg.com/latest.tar.gz | tar xvz && mv dist /yarn && apt-get update -y && apt-get upgrade -y && \
-  apt-get install --no-install-recommends -y xvfb git snapcraft qtbase5-dev xorriso bsdtar build-essential autoconf libssl-dev icnsutils libopenjp2-7 graphicsmagick gcc-multilib g++-multilib libgnome-keyring-dev lzip rpm yasm python libcurl3 && \
+  apt-get install --no-install-recommends -y locales xvfb git snapcraft qtbase5-dev xorriso bsdtar build-essential autoconf libssl-dev icnsutils libopenjp2-7 graphicsmagick gcc-multilib g++-multilib libgnome-keyring-dev lzip rpm yasm python libcurl3 && \
   curl -O http://mirrors.kernel.org/ubuntu/pool/universe/libi/libicns/libicns1_0.8.1-3.1_amd64.deb && dpkg --install libicns1_0.8.1-3.1_amd64.deb && unlink libicns1_0.8.1-3.1_amd64.deb && \
   wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - && echo "deb http://dl.google.com/linux/chrome/deb/ stable main" > /etc/apt/sources.list.d/google.list && \
   apt-get update && apt-get install -y google-chrome-stable && \

docker/build.sh

@@ -3,7 +3,7 @@ set -e
 
 docker build -t electronuserland/electron-builder:base docker/base
 
-docker build -t electronuserland/electron-builder:7 -t electronuserland/electron-builder:latest docker/7
+docker build -t electronuserland/electron-builder:8 -t electronuserland/electron-builder:latest docker/8
 docker build -t electronuserland/electron-builder:6 docker/6
 
 docker build -t electronuserland/electron-builder:wine docker/wine