### Official Helm Chart version

main (development)

### Apache Airflow version

2.2.3 (latest released)

### Kubernetes Version

1.21.5

### Helm Chart configuration

_No response_

### Docker Image customisations

_No response_

### What happened

If you don't have outbound routing to the internet, you cannot install/template/lint the helm chart, e.g:

```
$ helm upgrade --install oss ~/github/airflow/chart 
Release "oss" does not exist. Installing it now.
Error: values don't meet the specifications of the schema(s) in the following chart(s):
airflow:
Get "https://raw.githubusercontent.com/yannh/kubernetes-json-schema/master/v1.22.0-standalone-strict/networkpolicypeer-networking-v1.json": dial tcp: lookup raw.githubusercontent.com: no such host
```

### What you expected to happen

The chart should function without requiring outbound internet access.

### How to reproduce

Disable networking and try installing the chart.

### Anything else

We use external schema references in our chart, e.g:

https://github.com/apache/airflow/blob/8acfe8d82197448d2117beab29e688a68cec156a/chart/values.schema.json#L1298

Unfortunately, naively using relative filesystem reference in `values.schema.json` doesn't work properly in helm (see helm/helm#10481).

### Are you willing to submit PR?

- [X] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

scripts/ci/pre_commit/pre_commit_chart_schema.py
print("Invalid definitions: ")
    for no_d, (schema_type, schema_path) in enumerate(definitions_list, start=1):
        print(f"{no_d}: {schema_path}")
        print(json.dumps(schema_type, indent=2))
def walk(value, path='$'):
    yield value, path
    if isinstance(value, dict):
        for k, v in value.items():
            yield from walk(v, path + f"[{k!r}]")
    elif isinstance(value, (list, set, tuple)):
        for no, v in enumerate(value):
            yield from walk(v, path + f"[{no}]")
def validate_object_types():