Fix FATAL: role "root" does not exist #22
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This changes fix the error FATAL: role "root" does not exist.
Why?
You need to set the PGUSER environment variable, because psql and pg_isready are two different (although related) programs which have different logic of environment lookup (one looks for POSTGRES_USER, the other one – for PGUSER)
Source: https://stackoverflow.com/a/77171779/6391134