feat: manager-api need show version info

[starsz]

Feature request

Please describe your feature

Hi, I think manager-api needs version info.

Like: ./manager-api version

And when manager-api start, show the manager-api version.

releated #853

Describe the solution you'd like

In golang, there are some ways to manage version.

1. Create a file, named version.go and write the current version in this file.

2. Use go build ldflags. Such as
   go build -ldflags "-X main.VERSION=1.0.0 -X 'main.BUILD_TIME=date' -X 'main.GO_VERSION=go version'"
   We can add this into Makefile.

I prefer the second solution.

[juzhiyuan]

Do we have any ideas?

cc @liuxiran @tokers @nic-chen @membphis @ShiningRush @spacewander

[tokers]

AFAIK, Most golang projects are using the second way to inject the version info, like istio, etcd.

[membphis]

Most golang projects are using the second way to inject the version info, like istio, etcd.

This is a good reason.

[nic-chen]

second way +1
but could the version be read by status API mention in #849 ?

[tokers]

@nic-chen The status API in #849 exposes APISIX instances' data, which contains APISIX version.

[nic-chen]

@nic-chen The status API in #849 exposes APISIX instances' data, which contains APISIX version.

sure. I know that. but I think we should expose data of manager-api too.