sudo apt install libnss3-tools
git clone https://github.com/FiloSottile/mkcert && cd mkcert
go build -ldflags "-X main.Version=$(git describe --tags)"
Also install Go 1.13+
To generate an wildcard local ssl certificat for example.com
mkcert -install -key-file key.pem -cert-file cert.pem example.com *.example.com