Image Cleaner DaemonSet

## Image Cleaner DaemonSet Documentation

### Key Features/Components
- Runs as a DaemonSet to ensure one instance per node
- Utilizes Kubernetes downward API for node-specific configurations
- Periodically scans and cleans up unused Docker images
- Configurable thresholds for image age and disk usage

### Step-by-step instructions or configuration details
1. Create a Kubernetes ConfigMap with the necessary configurations:
```yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: image-cleaner-config
data:
  imageAgeThreshold: "30" # Age of images in days before cleanup
  diskUsageThreshold: "80" # Disk usage percentage before cleanup

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: image-cleaner
spec:
  selector:
    matchLabels:
      app: image-cleaner
  template:
    metadata:
      labels:
        app: image-cleaner
    spec:
      containers:
        - name: image-cleaner
          image: image-cleaner:latest
          volumeMounts:
            - name: config
              mountPath: /config
      volumes:
        - name: config
          configMap:
            name: image-cleaner-config
            defaultMode: 420