Enable server settings via config file and env vars #315
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Modify the viper settings in the serve subcommand to allow users to provide a config file using -c/--config vs. setting everything using command line flags.
Sinc this is based upon viper, the following config file extensions are supported: "json", "toml", "yaml", "yml", "properties", "props", "prop", "hcl", "tfvars", "dotenv", "env", and "ini".
This change also allows using env vars prefixed with FULCIO_SERVE to provide configuration settings as well.
Resolves #314