Maybe this https://github.com/crunchy-labs/crunchy-cli/issues/437#issuecomment-2198109971 can help?
There is also this thread https://forum.dfinity.org/t/icx-proxy-unknown-tls-backend/9828/2?u=peterparker.
Maybe it’s related to rustls and Docker? In this other GitHub issue someone mention resolving something similar by using another Linux distribution https://github.com/denoland/deno/issues/19177#issuecomment-1556875198