I have the full build pipeline now working on github.
linux/amd64 (x86_64), linux/arm/v7 and linux/arm64 images
are all available.
https://hub.docker.com/repository/docker/bbsio/synchronet/
I also have an example docker-compose file if you'd want
to go that route (slightly easier for more complex setups).
https://raw.githubusercontent.com/bbs-io/synchronet-docker /master/docker-compose.yml
The only noteworthy adjustments to the build from
defaults:
- ecweb4 is configured in modopts to
   use /sbbs/web (where the volume mount is).
- ctrl/text.dat is overwritten by the default when
   using a newer image.  You can use JS to set your
   overrides in mods/*.js
- interface ports in sbbs.ini are set to 0.0.0.0
   as ipv6 isn't well supported under Docker
   if you're using a saved configuration from another
   setup, you should remove the [::] ipv6 references
Thanks to DM for pointing out the github mirror with the
latest nighties, I'm able to query the github api for the
latest git hash for nightly and the latest sbbs release
tag this way.
----------------------------------------------
Aside: has anyone build synchronet *on* a raspberry pi?
The cross platform builds (via qemu on x64) seem to take
about 40m, wasn't sure if this was typical, more or less
than native hardware.
-- 
Michael J. Ryan (tracker1)
+o roughneckbbs.com
---
 þ Synchronet þ Roughneck BBS - roughneckbbs.com