Backup failed with postgresql connection error

I have tried the latest discourse with official Docker image few days, and I found the regular backup operation would be failed every time, the error log contains:

FATAL: Peer authentication failed for user "postgres"

When I typed this issue, I got few similar topic in the right, after I checked them I think this is still a new unfixed problem. And the solution comes from here, as current postgresql installed built in docker image, need change the configuration of postgresql like:

#TYPE  DATABASE        USER            ADDRESS                 METHOD
local    all             all                                     trust

So with this configuration the backup function would be work. I didn’t checked a lot in current issue list, if there is fix about it, please ignore this.