feat: add flag for specifying the apisix.yaml path

[tobsen111]

Description

When running apisix in standalone mode

I want to be able to change the path of the apisix.yaml the same way as changing the path for the config.yaml

I would love to see an additional flag/env_var to specify the path of apisix.yaml

[shreemaan-abhishek]

Hi, thanks for the request — confirming this is a real gap.

Today the -c/--config flag only overrides config.yaml (see the argparse block in start() in apisix/cli/ops.lua and customized_yaml_path() in apisix/core/profile.lua). The apisix.yaml location is hard-coded to apisix_home/conf/apisix.yaml in profile.lua's yaml_path() and is consumed directly by apisix/core/config_yaml.lua and apisix/cli/file.lua with no override hook. So your request is valid, and #11393 ran into the same pain point earlier.

We would welcome a PR that fixes this.