Cannot get a correct setup of SSL certificates

[gnutix]

I'm currently putting up an up-to-date Drifter environment on Ubuntu 18.04 with a LAMP stack for an HTTPS API project. I've set ssl: yes in virtualization/parameters.yml. After the provisioning, it generated a ca.crt file in my web root.

I've tried importing it in my "truststore", as stated in the doc, with the command keytool -v -import -file ca.crt -alias projectname -keystore my-cacerts. It had no output. I've restarted my Chrome (and then my computer), and Chrome still gives the same warning NET::ERR_CERT_AUTHORITY_INVALID when I access the API in HTTPS.

Am I missing something ? Did anyone set up a SSL certificate and could explain me the missing steps ?