corgi is a CGI server.

currently, it can handle one application.

`/etc/corgi.conf`
```
Script <path-to-cgi-script>
	Environment
		HTTP_HOST <hostname>
		ENV_KEY <some-env-value>
```

Sets the following environmental variables for the CGI script, many following [RFC 3875][rfc]:
- **`GATEWAY_INTERFACE`** to the fixed value `CGI/1.1`
- **`PATH_INFO`** to the HTTP path the client requested
- **`QUERY_STRING`** to the query part of the URI
- **`REQUEST_METHOD`** to the HTTP request method

[rfc]: https://datatracker.ietf.org/doc/html/rfc3875