Environment file (see systemd.exec(5) “EnvironmentFile=” section for the syntax) which sets config options for mattermost (see the Mattermost documentation). Settings defined in the environment file will overwrite settings set via Nix or via the services.mattermost.extraConfig option. Useful for setting config options without their value ending up in the (world-readable) Nix store, e.g. for a database password.

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