[pygobject/ci-old-py3] CI: switch the xenial test job to Python 3

[Christoph Reiter <creiter src gnome org>]

commit ab52acd77e7d0561169ae29c656da9649ea72f9f
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Tue Oct 8 15:56:53 2019 +0200

    CI: switch the xenial test job to Python 3
    
    This job tests our oldest supported setup. Switch it to Python 3
    so we can drop Python 2 support.

 .gitlab-ci.yml                | 2 +-
 .gitlab-ci/Dockerfile.old     | 3 +--
 .gitlab-ci/run-docker-old.sh  | 2 +-
 .gitlab-ci/test-docker-old.sh | 4 ++--
 4 files changed, 5 insertions(+), 6 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 7f0149e0..ee89057a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -104,7 +104,7 @@ pypy3.6:
 
 xenial-i386-py2:
   stage: build_and_test
-  image: registry.gitlab.gnome.org/gnome/pygobject/old:v2
+  image: registry.gitlab.gnome.org/gnome/pygobject/old:v3
   artifacts:
     paths:
       - coverage/
diff --git a/.gitlab-ci/Dockerfile.old b/.gitlab-ci/Dockerfile.old
index fa135de7..7988f64b 100644
--- a/.gitlab-ci/Dockerfile.old
+++ b/.gitlab-ci/Dockerfile.old
@@ -17,8 +17,7 @@ RUN apt-get update && apt-get install -y \
     libgtk-3-0 \
     libtool \
     locales \
-    python-dev \
-    python-virtualenv \
+    python3-dev \
     xauth \
     xvfb \
     && rm -rf /var/lib/apt/lists/*
diff --git a/.gitlab-ci/run-docker-old.sh b/.gitlab-ci/run-docker-old.sh
index 4dd17520..6f6a1d68 100755
--- a/.gitlab-ci/run-docker-old.sh
+++ b/.gitlab-ci/run-docker-old.sh
@@ -2,7 +2,7 @@
 
 set -e
 
-TAG="registry.gitlab.gnome.org/gnome/pygobject/old:v2"
+TAG="registry.gitlab.gnome.org/gnome/pygobject/old:v3"
 
 sudo docker build --build-arg HOST_USER_ID="$UID" --tag "${TAG}" \
     --file "Dockerfile.old" .
diff --git a/.gitlab-ci/test-docker-old.sh b/.gitlab-ci/test-docker-old.sh
index 91312c7c..8d451bc0 100755
--- a/.gitlab-ci/test-docker-old.sh
+++ b/.gitlab-ci/test-docker-old.sh
@@ -2,8 +2,8 @@
 
 set -e
 
-python --version
-virtualenv --python=python _venv
+python3 --version
+python3 -m venv _venv
 source _venv/bin/activate
 
 # ccache setup