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Environment variables (passed with -e):
POSTGRES_DB - database to be created, it has to be different than 'postgres';
POSTGRES_USER - user account to be created; it has to be different than 'postgres' and it will be granted SUPERUSER privileges;
POSTGRES_PASSWORD - password to be set for the user; if POSTGRES_USER will not be provided then 'postgres' user will get this password.
If POSTGRES_PASSWORD is not provided then no password will be needed to access the user.
You may use -v to point any local directory to be your database data.