I installed Discourse using the launcher at https://github.com/discourse/discourse_docker/. I kept the configuration from samples/standalone.yml almost unchanged, except that I had to change the port 80 because there is an apache running on the host. That apache is now set up to act as reverse proxy, forwarding requests to localhost:8088, which is the port that I bound the Discourse container to.
The admin interface says I am on Discourse version https://github.com/discourse/discourse/tree/3eb0288adb16eae63514657b71ae9c38433a1f5c.
Stuff seems to basically work, I can create an account and create topics etc. However, activating an account does not work: Pressing the button on the confirmation page has no effect. (How did I log in to create a topic, you may wonder? I used the “Forgot Password” functionality.) This is with Firefox 42. The JS error console shows
15:32:40.704 ReferenceError: $ is not defined1 vendor-5939aced2df07b0bcc1c101662121c68.js:1:285