Bug 1291365 - Specify Ubuntu version in ubuntu1604-test image; r=dustin
Without this, we'll use the latest Ubuntu release at image build time!
MozReview-Commit-ID: DmUcwKPkL78
--- a/testing/docker/ubuntu1604-test/Dockerfile
+++ b/testing/docker/ubuntu1604-test/Dockerfile
@@ -1,9 +1,9 @@
-FROM ubuntu
+FROM ubuntu:16.04
MAINTAINER Joel Maher <joel.maher@gmail.com>
RUN useradd -d /home/worker -s /bin/bash -m worker
WORKDIR /home/worker
# install non-build specific dependencies in a single layer
ADD system-setup.sh /tmp/system-setup.sh
RUN bash /tmp/system-setup.sh
