**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/cli_parser.py
ActionCommand(
        name='list',
        help='List variables',
        func=lazy_load_command('airflow.cli.commands.variable_command.variables_list'),
        args=(),
    ),
    ActionCommand(
        name='get',
        help='Get variable',
        func=lazy_load_command('airflow.cli.commands.variable_command.variables_get'),
        args=(ARG_VAR, ARG_JSON, ARG_DEFAULT),
    ),
    ActionCommand(
        name='set',
        help='Set variable',
        func=lazy_load_command('airflow.cli.commands.variable_command.variables_set'),
        args=(ARG_VAR, ARG_VAR_VALUE, ARG_JSON),
    ),
    ActionCommand(
        name='delete',
        help='Delete variable',
        func=lazy_load_command('airflow.cli.commands.variable_command.variables_delete'),
        args=(ARG_VAR,),
    ),
    ActionCommand(
        name='import',
        help='Import variables',
        func=lazy_load_command('airflow.cli.commands.variable_command.variables_import'),
        args=(ARG_VAR_IMPORT,),
    ),