How to use own ssl certificate

hi, so far i have traefik with ssl disabled and it redirects requests to servers in 80 http.
since they are internal portals and not public and consequently do not reach the certresolver, how do i tell traefik to use a default wildcard certificate provided by me, so that the portals are reachable cmq in https?

I use docker-compose.yml for the various services and for traefik

This is discussed here regularly, check other posts and the Traefik doc.

You need to load the certs in dynamic config file, which is read through providers.file in static config. Then enable TLS on entrypoint globally or on router.