vagrant-trellis-cert’s author here.
If @aitor or anyone finds our what’s happening, send a PR or create an issue on GitHub - TypistTech/vagrant-trellis-cert: Trust all Trellis self-signed certificates with a single command Thanks in advance.
Even better if you can port the functionality to trellis-cli. Vagrant’s plugin system is changing. When it comes, vagrant-trellis-cert would be rendered useless.