This is caused by Celery dropping the "sqlite" transport alias from version
4.3.0, so I've pinned an upper limit.
# A docker-compose recipe for MediaGoblin hacking.
#
# Tested on Trisquel 8 and Guix System. Currently runs Python 3 and works for
-# photos and video. Audio raises an exception "NameError: name 'audiolab' is not
-# defined".
+# images, audio and video.
#
# To run the system:
#
'pytest>=2.3.1',
'pytest-xdist',
'werkzeug>=0.7,<1.0.0',
- 'celery>=3.0',
+ # Celery 4.3.0 drops the "sqlite" transport alias making our tests fail.
+ 'celery>=3.0,<4.3.0',
# Jinja2 3.0.0 uses f-strings (Python 3.7 and above) but `pip install` on
# Debian 9 doesn't seem to respect Jinja2's 'python_requires=">=3.6"' line.
'jinja2<3.0.0',