Create a read only user on psql

readonly_user.sql

CREATE ROLE _readonly_user_name_ WITH LOGIN PASSWORD '_readonly_user_password_' 
NOSUPERUSER INHERIT NOCREATEDB NOCREATEROLE NOREPLICATION VALID UNTIL 'infinity';

GRANT CONNECT ON DATABASE _database_to_give_access_ TO _readonly_user_name_;
GRANT USAGE ON SCHEMA public TO _readonly_user_name_;
GRANT SELECT ON ALL TABLES IN SCHEMA public TO _readonly_user_name_;
GRANT SELECT ON ALL SEQUENCES IN SCHEMA public TO _readonly_user_name_;
ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO _readonly_user_name_;