Create dump:
docker exec -i CONTAINER_NAME /bin/bash -c "PGPASSWORD=DATABASE_PASSWORD pg_dump --username DATABASE_USER -h RDS_HOST DATABASE_NAME" > ./dump.sql
Create local db to restore dump:
create database "db-restored"
Restore dump:
docker exec -i CONTAINER_NAME /bin/bash -c "PGPASSWORD=DATABASE_PASSWORD psql --username DATABASE_USER db-restored" < ./dump.sql