[PATCH 6/7] docker: add Python3.6 to image

[Daniel Axtens]

This is needed to support py3.6-django111 in tox - otherwise tox
fails.

Python3.6 is not in Xenial, so this - irritatingly - requires pulling
in either a PPA, or the package from Artful. PPAs are icky, so pull it
in from Artful.

We can either add an Artful repo (like we do for Trusty to pull in
python3.4), or move the image to Artful and add in the Xenial repo
to get python3.5. It's more efficient to move the entire image to
Artful and pull in 3.5 from Xenial - otherwise most packages get
downloaded from Artful anyway. It does mean we're going to need to
move again to Bionic in a few months, but we'll just have to deal.

Signed-off-by: Daniel Axtens <dja at axtens.net>
---
 tools/docker/Dockerfile  | 9 +++++----
 tools/docker/xenial.list | 3 +++
 2 files changed, 8 insertions(+), 4 deletions(-)
 create mode 100644 tools/docker/xenial.list

diff --git a/tools/docker/Dockerfile b/tools/docker/Dockerfile
index 946c646188e5..eb6d35d82528 100644
--- a/tools/docker/Dockerfile
+++ b/tools/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu
+FROM ubuntu:17.10
 
 ARG UID=1000
 
@@ -12,14 +12,15 @@ ENV DEBIAN_FRONTEND noninteractive
 ENV PYTHONUNBUFFERED 1
 
 # System
-# python3.4-minimal libpython3.4-stdlib libpython3.4-minimal \
-# findutils is for python3.4... :/
+# trusty and findutils is for python3.4
+# xenial is for python3.5
 COPY tools/docker/trusty.list /etc/apt/sources.list.d/trusty.list
+COPY tools/docker/xenial.list /etc/apt/sources.list.d/xenial.list
 RUN apt-get update -qq && \
     apt-get install -y --no-install-recommends --allow-downgrades \
     python-dev python-pip python-setuptools python-wheel \
     python3.5-dev python3-pip python3-setuptools python3-wheel \
-    python3.4-dev findutils=4.4.2-7 \
+    python3.4-dev findutils=4.4.2-7 python3.6-dev \
     libmysqlclient-dev mysql-client curl unzip xvfb chromium-chromedriver \
     chromium-browser build-essential git postgresql-client && \
     ln -s /usr/lib/chromium-browser/chromedriver /usr/bin/
diff --git a/tools/docker/xenial.list b/tools/docker/xenial.list
new file mode 100644
index 000000000000..a70ff56aa552
--- /dev/null
+++ b/tools/docker/xenial.list
@@ -0,0 +1,3 @@
+deb http://archive.ubuntu.com/ubuntu/ xenial main
+deb http://archive.ubuntu.com/ubuntu/ xenial-updates main
+deb http://security.ubuntu.com/ubuntu xenial-security main
-- 
2.14.1