`HEALTHCHECK_ENDPOINT` should change with the value of `--address`

[Congrool]

LocalAI version:

commit: a95bb05

Environment, CPU architecture, OS, and Version:

Describe the bug

When I use the --address option to use another port instead of 8080, docker healthcheck probe always fails beacause it still fetches the readyz on 8080 port.

It can work around if adding -e HEALTHCHECK_ENDPOINT=$MYADDR/readyz when docker run the container. But it seems that there's no document talking about this setting.

Expecting that either adding the instruction to doc, or making the HEALTHCHECK_ENDPOINT more automatic.