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Donncha Ó Cearbhaill
dab82e38d0
Plugin packages need somewhere to keep their own settings, but MVT rewrites its config.yaml with only the fields it knows about, so any foreign section is dropped. Add MVTPluginSettings, a pydantic-settings base class that gives each plugin its own file under the MVT config folder and its own MVT_PLUGIN_<NAME>_ environment variable namespace. Settings resolve from constructor arguments, then the environment, then the plugin file, then the field defaults. Saving skips the values the environment currently supplies, so credentials passed as environment variables are not copied to disk, and writes through a private temporary file so a settings file is never partially written or briefly readable by other users.