ops does not support HTTP_PROXY and HTTPS_PROXY env var

- [x] I have searched the [issues](https://github.com/apache/openserverless/issues) of this repository and believe that this is not a duplicate.

### Ⅰ. Issue Description
Since we are using the go git library it is supposed it supports the standard environment variables HTTP(S)_PROXY ... but it does not.

### Ⅱ. Describe what happened

seth the variables, and try ops -update... error!

### Ⅲ. Describe what you expected to happen

it should work!

### Ⅳ. How to reproduce it (as minimally and precisely as possible)

set the variables and try it

### Ⅴ. Anything else we need to know?

### Ⅵ. Environment:

- K8S Runtime and version:
- OPS CLI version: 0.1.0-2409121919.dev
- Others:

ops CLI の更新パスと Go git library の使用箇所から始め、HTTP_PROXY と HTTPS_PROXY を設定した後に障害を再現し、その後、変数がどのように git 操作まで到達するかを追跡します。完了の条件は、設定されたプロキシ経由で `ops -update` が動作し、環境変数のリグレッションチェックがあることです。

索引モデルが issue の本文から書いたものです。