CI: allow insecure connection for downloading `lily`
CI: allow insecure connection for downloading `lily`

otherwise the error:

`curl: (60) SSL certificate problem: unable to get local issuer certificate`

is raised. The insecure connection should not be an issue,
because the file's checksum is checked.

tulip-control/tulip-control,tulip-control/tulip-control,tulip-control/tulip-control,tulip-control/tulip-control