Improve handling of secret variables and files in autoconfig #2141
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In the recent state, the autoconfig feature required either all database secrets to be passed as environment variables, or all to be passed as secret files, but didn't allow to use a mix of these variants, e.g. passing the database user and name as environment variables, and only the password as a file.
This is now fixed and allows working with database values the same way, as the Postgres and MySQL/MariaDB images do; with mixed variants also.