[Etherpad] Migrate main instance from MySQL to PostgreSQL

4 jobs for master in 7 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
canceled #955339
build
build

00:00:07

 
  Security Tests
canceled #955340
build
clair

canceled #955341
build allowed to fail manual
docker-bench-security

 
  Push
canceled #955342
build manual
push-prod