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Put the configuration data that wouldn't be true for everybody in environment variables.

Use os.Getenv() to retrieve the variables at runtime. Make sure they are set to something valid looking (at least not empty string) as part of your program's configuration.

You can then set the environment variables in a systemd configuration file if you're running this from systemd, or in the .bash_config for a user dedicated to this process, or wherever is the most convenient for where your program is executed.

Or, create a configuration file you can read from your program. I usually use Json encoding for configuration like this, but you could use anything. Reading secrets from configuration files might arguably be somewhat safer than environment variables which can often be introspected by system processes.

When I create a configuration file, I usually model my configuration with a struct,