kubectl found no usable kubeconfig: KUBECONFIG is unset or points at a missing file, and there is no ~/.kube/config. Generate one with your provider's command (aws eks update-kubeconfig, gcloud get-credentials, az aks get-credentials) or export KUBECONFIG to the right path. Then kubectl config current-context prints your context.

## The error
```text
error: Missing or incomplete configuration info.  Please point to an existing, complete config file:
```

## What to do
1. See what kubectl is looking at:
```bash
echo $KUBECONFIG
ls -la ~/.kube/config
```
   Expected: Shows whether the env var is set and whether the default file exists.
2. Fetch a fresh config from your provider, e.g. for EKS:
```bash
aws eks update-kubeconfig --name [cluster] --region [region]
```
   Expected: Prints 'Added new context ...'.
3. Or point at an existing file:
```bash
export KUBECONFIG=/path/to/config
```
   Expected: No output; the variable is set.
4. Verify:
```bash
kubectl config current-context
```
   Expected: Prints a context name, no error.

## When this applies
- fresh machines or CI runners with no kubeconfig yet
- KUBECONFIG pointing at a deleted or moved file
- the exact Missing or incomplete configuration info message

## When it does NOT apply
- a config file exists but the cluster is unreachable (different error)
- expired credentials or forbidden errors

## Works with
all kubectl versions; AWS/GKE/AKS CLIs for the provider step

### error: no configuration has been provided
Older client-go wording for the same missing-config situation. Same fix.

## Why it happens
kubectl resolves config from --kubeconfig, then $KUBECONFIG, then ~/.kube/config. When all three come up empty it can not build a client, so it errors before any network call.

## Edge cases
- In CI, export KUBECONFIG in the same step that runs kubectl - env vars do not survive across separate job steps unless persisted.
- A KUBECONFIG listing several files merges them; a typo in one path silently drops that file.

## Resolved from
gh:kubernetes/kubectl#523 - https://github.com/kubernetes/kubectl/issues/523