**Apache Airflow version**: 1.10.12

**Kubernetes version** : 1.17.9

**Environment**:

- **Cloud provider or hardware configuration**: Azure Kubernetes Service
- **OS** (e.g. from /etc/os-release): Linux
- **Install tools**: Helm chart (/chart in repo) 
- **Others**:

**What happened**:
Pod cannot run since `airflow-cleanup-pods` is not in $PATH
```
Error: failed to start container "airflow-cleanup-pods": Error response from daemon: OCI runtime create failed: container_linux.go:349: starting container process caused "exec: \"airflow-cleanup-pods\": executable file not found in $PATH": unknown
```

**What you expected to happen**: 
Cleanup job pod runs

<!-- What do you think went wrong? -->

**How to reproduce it**:
* Deploy Helm Chart
* Manually trigger `airflow-cleanup ` CronJob 
* See it cannot run since `airflow-cleanup-pods` is not in $PATH
airflow/cli/commands/kubernetes_command.py
#
#
"""Kubernetes sub-commands"""
import os
import yaml
from kubernetes.client.api_client import ApiClient
from airflow.executors.kubernetes_executor import KubeConfig, create_pod_id
from airflow.kubernetes import pod_generator
from airflow.kubernetes.pod_generator import PodGenerator
from airflow.models import TaskInstance
from airflow.settings import pod_mutation_hook
from airflow.utils import cli as cli_utils
from airflow.utils.cli import get_dag
@cli_utils.action_logging
def generate_pod_yaml(args):
    """Generates yaml files for each task in the DAG. Used for testing output of KubernetesExecutor"""