https in pimatic with mkcert

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Hi,
I tried to set up https on locally running Pimatic instance. As browsers don’t trust selfsigned certificates I wanted to use mkcert

First I couldn’t set up mkcert on raspberry. I tried then mkcert nodejs package. I generate the cert files but as output I get only .key and .crt files and no .pem file. Now I don’t know how to correctly configure pimatic with it. Does anyone has experience with setting up trusted SSL on local network for pimatic?

I create my SSL certficate with Let’s Encrypt and a public domain name, that comes from a dyndns provider.
My internet router proxies the request to the pimatic based on the ports.
By that I can access my pimatic from everywhere with the public dyn dns domain name.