respect IdentityFile ssh config when using ssh agent socket

[tompson]

What happened?

We are using 1Password SSH Agent for managing our ssh keys

the SSH_AUTH_SOCK is set to the 1Password agent

when trying to run kubeone we get the following error:

kubeone apply --manifest kubeone.yaml -t output.json --verbose
INFO[11:53:34 CEST] Determine hostname...
ERRO[11:53:34 CEST] ssh: dialing
connection to: 5.75.143.85:22
ssh: handshake failed: ssh: disconnect, reason 2: Too many authentication failures  node=23.24.55.66

this is because there are more than 6 ssh keys in the agent available

it seems that kubeone does not respect the IdentityFile set in ~/.ssh/config like

Host 23.24.55.66
    IdentityFile ~/.ssh/public-key-for-kubeone.pub

Expected behavior

kubeone should respect the IdentityFile ssh config for the hosts

How to reproduce the issue?

add more than 6 ssh keys to the ssh agent and make sure that the one fitting for the host is ordered last

What KubeOne version are you using?

$ kubeone version
{
  "kubeone": {
    "major": "1",
    "minor": "8",
    "gitVersion": "1.8.0",
    "gitCommit": "c280d14d95ac92a27576851cc058fc84562fcc55",
    "gitTreeState": "",
    "buildDate": "2024-05-14T15:41:44Z",
    "goVersion": "go1.22.3",
    "compiler": "gc",
    "platform": "darwin/amd64"
  },
  "machine_controller": {
    "major": "1",
    "minor": "59",
    "gitVersion": "v1.59.1",
    "gitCommit": "",
    "gitTreeState": "",
    "buildDate": "",
    "goVersion": "",
    "compiler": "",
    "platform": "linux/amd64"
  }
}

What cloud provider are you running on?

Hetzner Cloud

What operating system are you running in your cluster?

Ubuntu 22.04

[kron4eg]

Unfortunately we don't have any support for ~/.ssh/config.