[pygobject] CI: test with Python 3.9

[Christoph Reiter <creiter src gnome org>]

commit b991b9d31d224b50e64664845f3d57677097ca7d
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Tue Oct 6 11:15:15 2020 +0200

    CI: test with Python 3.9

 .gitlab-ci.yml           | 7 ++++++-
 .gitlab-ci/Dockerfile    | 1 +
 .gitlab-ci/run-docker.sh | 2 +-
 3 files changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1d267ae4..44045d80 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: registry.gitlab.gnome.org/gnome/pygobject/main:v14
+image: registry.gitlab.gnome.org/gnome/pygobject/main:v15
 
 stages:
   - build_and_test
@@ -80,6 +80,11 @@ python3.8:
     PYENV_VERSION: "3.8.5-debug"
   <<: *defaults
 
+python3.9:
+  variables:
+    PYENV_VERSION: "3.9.0-debug"
+  <<: *defaults
+
 pypy3.6:
   allow_failure: true
   variables:
diff --git a/.gitlab-ci/Dockerfile b/.gitlab-ci/Dockerfile
index 5c490b60..c2f1c652 100644
--- a/.gitlab-ci/Dockerfile
+++ b/.gitlab-ci/Dockerfile
@@ -45,5 +45,6 @@ RUN pyenv install pypy3.6-7.3.1
 RUN pyenv install 3.6.12
 RUN pyenv install --debug 3.7.9
 RUN pyenv install --debug 3.8.5
+RUN pyenv install --debug 3.9.0
 
 ENV PATH="/usr/lib/ccache:${PATH}"
diff --git a/.gitlab-ci/run-docker.sh b/.gitlab-ci/run-docker.sh
index 9207a4a4..8b7d24df 100755
--- a/.gitlab-ci/run-docker.sh
+++ b/.gitlab-ci/run-docker.sh
@@ -2,7 +2,7 @@
 
 set -e
 
-TAG="registry.gitlab.gnome.org/gnome/pygobject/main:v14"
+TAG="registry.gitlab.gnome.org/gnome/pygobject/main:v15"
 
 sudo docker build --build-arg HOST_USER_ID="$UID" --tag "${TAG}" \
     --file "Dockerfile" .