setup v2ray

Setup V2Ray for GitHub actions.

- uses: wangsijie/setup-v2ray@v1
    with:
      config-base64: ${{ secrets.CONFIG }}

works like:

- run: curl ip.sb # see if it is the proxy server's ip
  env:
    http_proxy: "127.0.0.1:1080"

config

config-base64 is base64 encoded string of V2Ray's config.json