Feature request: Add github api create merge request about git-repo-go

@jiangxin all works can be implement at client side .no more need to hack into git core.

I made some rush code to implement it.

see: https://github.com/cnmade/git-cpr/blob/for/dev/main.go

It works for me

For example:

1. know the origin URL , for me , like https://github.com/cnmade/bsmi-kb.git
2. detect if the URL start with https://github.com and end with .git
3. if match the rules, we know how to get the full repo : substr(0, 19), then substr(-4,4)
4. we now get cnmade/bsmi-kb
5. POST https://api.github.com/repos/{owner}/{repo}/pulls, for this repo, we know: https://api.github.com/repos/cnmade/bsmi-kb/pulls

curl \
  -X POST \
  -H "Accept: application/vnd.github.v3+json" \
  https://api.github.com/repos/cnmade/bsmi-kb/pulls \
  -d '{"head":"for/master","base":"master"}'

6. job finished.

[jiangxin]

When I contributed "proc-receive" and "report-status-v2" to Git, Peff (Jeff King from GitHub) told me github has a tailored version of git-receive-pack, so it's not possible for github to support "proc-receive" quickly.

If you want to create pull request using github API, it's better to use github CLI tool. When creating pull request this way, you have to create a real topic branch, and cannot do like agit-flow or gerrit, which are built-in in this tool.

[jiangxin]

See what we discussed in git mailing list: https://lore.kernel.org/git/[email protected]/