**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
tests/cli/commands/test_kubernetes_command.py
#
#
import os
import tempfile
import unittest
from airflow.cli import cli_parser
from airflow.cli.commands import kubernetes_command
class TestGeneratteDagYamlCommand(unittest.TestCase):
    @classmethod
    def setUpClass(cls):
        cls.parser = cli_parser.get_parser()
    def test_generate_dag_yaml(self):
        with tempfile.TemporaryDirectory("airflow_dry_run_test/") as directory:
            file_name = "example_bash_operator_run_after_loop_2020-11-03T00_00_00_plus_00_00.yml"
            kubernetes_command.generate_pod_yaml(self.parser.parse_args([
                'kubernetes', 'generate-dag-yaml',
                'example_bash_operator', "2020-11-03", "--output-path", directory]))
            self.assertEqual(len(os.listdir(directory)), 1)
            out_dir = directory + "/airflow_yaml_output/"
            self.assertEqual(len(os.listdir(out_dir)), 6)
            self.assertTrue(os.path.isfile(out_dir + file_name))
            self.assertGreater(os.stat(out_dir + file_name).st_size, 0)