As you named your postgres container db, you should use db as database host.

Is there any way to migrate wbb 3.1 to nodebb?

During installation of NodeBB i got that error:

ERR! sharp FreeBSD systems require manual installation of libvips >= 8.7.0
ERR! sharp Please see http://sharp.pixelplumbing.com/page/install
gmake: Wejście do katalogu '/usr/home/artur9010/domains/mydomain.com/public_nodejs/node_modules/sharp/build'
  TOUCH Release/obj.target/libvips-cpp.stamp
  CXX(target) Release/obj.target/sharp/src/common.o
../src/common.cc:25:10: fatal error: 'vips/vips8' file not found
#include <vips/vips8>
         ^~~~~~~~~~~~
1 error generated.
gmake: *** [sharp.target.mk:124: Release/obj.target/sharp/src/common.o] Błąd 1
gmake: Opuszczenie katalogu '/usr/home/artur9010/domains/mydomain.com/public_nodejs/node_modules/sharp/build'
gyp ERR! build error
gyp ERR! stack Error: `gmake` failed with exit code: 2
gyp ERR! stack     at ChildProcess.onExit (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:262:23)
gyp ERR! stack     at ChildProcess.emit (events.js:182:13)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:239:12)
gyp ERR! System FreeBSD 11.2-RELEASE-p2
gyp ERR! command "/usr/local/devil/node10/bin/node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
gyp ERR! cwd /usr/home/artur9010/domains/mydomain.com/public_nodejs/node_modules/sharp
gyp ERR! node -v v10.9.0
gyp ERR! node-gyp -v v3.7.0
gyp ERR! not ok
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] install: `(node install/libvips && node install/dll-copy && prebuild-install) || (node-gyp rebuild && node install/dll-copy)`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
 
npm ERR! A complete log of this run can be found in:
npm ERR!     /home/artur9010/.npm/_logs/2018-12-16T02_48_16_150Z-debug.log

debug.log: https://gist.github.com/artur9010/293deed43cb2cf231f2c1c595ce78b98