help request: apisix file-standalone mode config apisix.yaml path

### Description

How to customize the default path of apisix.yaml/apisix.json via args or env vars for K8s hot reload?

I am currently deploying APISIX in a Kubernetes environment using Standalone mode, and I mount the configuration files via K8s volumes.
My goal is to enable hot reloading for the configuration. However, it seems this isn't working as expected, and I suspect it might be related to the file path.
Could you please advise on how to change the default path of apisix.yaml or apisix.json? Specifically, is there a way to override this default path using startup arguments or environment variables?
Any guidance or best practices for achieving file hot reload in K8s would be greatly appreciated.

### Environment

- APISIX version (run `apisix version`): apache/apisix:3.16.0
- Operating system (run `uname -a`):
- OpenResty / Nginx version (run `openresty -V` or `nginx -V`):
- etcd version, if relevant (run `curl http://127.0.0.1:9090/v1/server_info`): file
- APISIX Dashboard version, if relevant:
- Plugin runner version, for issues related to plugin runners:
- LuaRocks version, for installation issues (run `luarocks --version`):

Start by checking the APISIX standalone-mode configuration entry points for apisix.yaml and apisix.json, along with how Kubernetes volumes are mounted. Confirm whether startup arguments or environment variables can override the path and whether mounted-file changes trigger hot reload; document the supported configuration or the specific missing behavior.

Written by the indexing model from the issue text.