## Problem
- Running the command according to docker.md gives warning and error.
- Warning `permissions should be u=rw (0600) or less` is output when
executing `psql -h localhost -p 55433 -U cloud_admin`.
- `FATAL: password authentication failed for user "root”` is output in
compute logs.
## Summary of changes
- Add `$ chmod 600 ~/.pgpass` in docker.md to avoid warning.
- Add username (cloud_admin) to pg_isready command in docker-compose.yml
to avoid error.
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Co-authored-by: Tomoka Hayashi <tomoka.hayashi@ntt.com>
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