AEP: implement github client for enterprise github domains

[alex60217101990]

I want to use your github action: https://github.com/wangyoucao577/go-release-action but when calling the utility: https://github.com/wangyoucao577/go-release-action/blob/ec68290905b5e90fcab97069f9546af4303dd91a/release.sh #L190 I get an error. After debugging, I found in your code:

assets-uploader/cmd/github-assets-uploader/main.go

Line 66 in a87fed0

client := github.NewClient(tc)

you only use a regular client, without the ability to use: https://github.com/google/go-github/blob/v17.0.0/github/github.go#L272. Can you please make the utility and github action more universal so that you can redefine api.github.com to the desired one ?

[wangyoucao577]

Actually the github-assets-uploader tool will use WithEnterpriseURLs when -baseurl is set.
see

assets-uploader/cmd/github-assets-uploader/main.go

Lines 66 to 69 in a87fed0

	client := github.NewClient(tc)
	if baseUrl != "" {
	client, _ = client.WithEnterpriseURLs(baseUrl, baseUrl)
	}

However, the go-release-action doesn't support it yet since I don't have enviornment to test it.
Here's some idea that how to enable the feature on go-release-action wangyoucao577/go-release-action#165. It will be helpful if you can test it, PR is welcome once it's ok.

[wangyoucao577]

@alex60217101990 Would you please have a try with wangyoucao577/go-release-action@feature/baseurl? Since I don't have enterprise environment to test it.