Support for another SSH key type besides `id_rsa`

[ii64]

Is your feature request related to a problem? Please describe

When trying to use huber for either install or search a package it yields an error message:

huber search k3s
error: authentication required but no callback set; class=Ssh (23); code=Auth (-16)%

After looking at the code for a glance, it seems that the support for SSH key appear only supported RSA key which is denoted by concatenation of path with id_rsa at:

huber/crates/app/src/component/github.rs

Line 91 in 9850d02

let p = dirs::home_dir().unwrap().join(".ssh").join("id_rsa");

For somebody that does not using RSA for SSH keys, this can lead to the aforementioned issue. For example, I am now, on my current computer only has id_ed25519 and id_ecdsa_sk.

Describe the solution you'd like

What I was thinking for this is that if we could make of use running SSH agent to authenticate the git operations as the agent always carried on the ENVs:

env | grep AGENT
SSH_AGENT_PID=37358

Describe alternatives you've considered

I guess by continuing the previous approach but now we are doing some sort of scanning on known SSH key file name list.

Additional context

No additional context as of now.