10c6be32e4
Main use-case for me is to specify `-config.expand-env=true` which
allows me inject secrets via systemd's environment file mechanism[1]
like this:
storage.trace.s3 = {
/* all the other stuff */
secret_key = "\${GARAGE_SECRET_KEY}";
};
[1] https://grafana.com/docs/tempo/latest/configuration/#use-environment-variables-in-the-configuration
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