adding configurations for charts

[nicholasSUSE]

Issue: #444

Adding the configuration options for Charts release process inside ecm-distro-tools.

Resulting config.json:

~/.ecm-distro-tools » cat config.json
{
 "user": {
  "email": "[email protected]",
  "github_username": ""
 },
 "k3s": {
  "versions": {
   "v1.x.y": {
    "old_k8s_version": "v1.x.z",
    "new_k8s_version": "v1.x.y",
    "old_k8s_client": "v0.x.z",
    "new_k8s_client": "v0.x.y",
    "old_suffix": "k3s1",
    "new_suffix": "k3s1",
    "release_branch": "release-1.x",
    "workspace": "/home/nick/WORK/SOFTWARE/go/src/github.com/k3s-io/kubernetes/v1.x.z",
    "k3s_repo_owner": "k3s-io",
    "system_agent_installer_repo_owner": "rancher",
    "k8s_rancher_url": "[email protected]:k3s-io/kubernetes.git",
    "k3s_upstream_url": "[email protected]:k3s-io/k3s.git",
    "dry_run": false
   }
  }
 },
 "rancher": {
  "versions": {
   "v2.x.y": {
    "release_branch": "release/v2.x",
    "rancher_repo_owner": "rancher",
    "issue_number": "",
    "check_images": [],
    "base_registry": "stgregistry.suse.com",
    "registry": "registry.rancher.com",
    "prime_artifacts_bucket": "prime-artifacts",
    "dry_run": false,
    "skip_status_check": false
   }
  }
 },
 "rke2": {
  "versions": [
   "v1.x.y"
  ]
 },
 "charts": {
  "workspace": "/home/nick/WORK/SOFTWARE/go/src/github.com/rancher/charts",
  "charts_repo_url": "https://github.com/rancher/charts",
  "charts_fork_url": "",
  "dev_branch": "dev-v2.9",
  "release_branch": "release-v2.9"
 },
 "auth": {
  "drone": {
   "k3s_pr": "YOUR_TOKEN",
   "k3s_publish": "YOUR_TOKEN",
   "rancher_pr": "YOUR_TOKEN",
   "rancher_publish": "YOUR_TOKEN"
  },
  "github_token": "YOUR_TOKEN",
  "ssh_key_path": "path/to/your/ssh/key"
 }
}