[llvm] [GitHub] Add workflow to check author's commit access on new PRs (PR #123593)

[David Spickett via llvm-commits]

================
@@ -290,6 +290,32 @@ def run(self) -> bool:
         return True
 
 
+class CheckCommitAccess:
+    def __init__(self, token: str, repo: str, pr_number: int, author: str):
+        self.repo = github.Github(token).get_repo(repo)
+        self.pr = self.repo.get_issue(pr_number).as_pull_request()
+        self.author = author
+
+    def can_merge(self, user: str) -> bool:
+        try:
+            return self.repo.get_collaborator_permission(user) in ["admin", "write"]
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DavidSpickett wrote:

I did not know about this, however I don't think we can use it here.https://pygithub.readthedocs.io/en/stable/github_objects/Repository.html?highlight=get_collaborator_permission#github.Repository.Repository.get_collaborators returns a list of all collaborators in the form of https://pygithub.readthedocs.io/en/stable/github_objects/NamedUser.html#github.NamedUser.NamedUser, which doesn't have a way to get to the permissions.

I see existing code on GitHub mainly using `get_collaborators` to get a list of usernames, then passing those one by one to `get_collaborator_permission`. I presume in workflows that cover the whole project not just one PR, here we just have them to check.

https://github.com/llvm/llvm-project/pull/123593