Add SSL certificate to Bitnami Keycloak (Keycloak helm deployed in Rancher RKE)

I have installaed Keycloak from Bitnami helm chart onto my Rancher RKE cluster. I need help getting letsencrypt on it (certbot maybe?) so that I can auto renew my ssl and use https.

I also would like to add a theme to Keycloak, can I get help with this also?