feat(config): Support kubeconfig

[gaocegege]

Please describe what you would like to see in ContainerSSH

kubernetes:
  connection:
    host: your-kubernetes-api-server:6443
    cert: |
      -----BEGIN CERTIFICATE-----
      ...
      -----END CERTIFICATE-----
    key: |
      -----BEGIN RSA PRIVATE KEY-----
      ...
      -----END RSA PRIVATE KEY-----
    cacert: |
      -----BEGIN CERTIFICATE-----
      ...
      -----END CERTIFICATE-----

The config is not user-friendly when running outside of kubernetes.

Please describe the solution you'd like

It will be better to support kubeConfigPath:

kubernetes:
    kubeConfigPath: ~/.kube/config

A clear and concise description of what you want to happen.

Please describe your use case

A clear and concise description of how you would use this feature.

By the looks of it, Kubeconfig support has made it into the Go client library as clientcmd.BuildConfigFromFlags so this should be possible.

[gaocegege]

Yep I found the implementation in this repo. But it is not used in config

[gaocegege]

kubernetes/kubeconfig.go

Line 17 in f4b3a27

func (config *KubeRunConfig) SetConfigFromKubeConfig() (err error) {

That is a very rudimentary implementation from the days where the only code parsing a Kubeconfig file was in the kubectl codebase.