EDIT: Some of these steps are unnecessary - see post below by @kraml
I now have my second Discourse instance running.
- Checked out the Discourse code into
/var/[myforum] - Took the content of
standalone.ymlfrom/samplesand created/containers/[myforum].yml - In
/containers/[myforum].yml - replaced all instances of
/var/discoursewith/var/[myforum](e.g. volume configuration) - set unique ports
- Ran
./launcher bootstrap [myforum].yml - Ran
./launcher start [myforum].yml - Added nginx config for the new domain
And it’s working perfectly first time. Another win for Discourse!