add author of a pr as assignee

Author: dbasunag

.github/README.md

@@ -6,6 +6,7 @@
 - Run `tox`
 - Close stale PRs
 - Check for offensive language
+- Assigns the PR to the author
 
 ### On user action
 - Add to or remove a label from PR; supported labels: `wip`, `lgtm`, `verified`, and `hold`.  
@@ -23,7 +24,6 @@
 
 ## To be added
 - Block merging if not all defined checks pass. For example: a `verified` label was added and at least 2 approvals.
-- When a PR is opened, assign the PR to the PR owner
 - When a PR is opened, add reviewers (requires updates to OWNERS file(s))
 - When a PR is reviewed/commented by a user who's not the PR owner, add `reviewed|commented|approved-by-<username>` label
 - When a PR is ready to be merged (all checks passed), add `ready-to-merge` label

.github/workflows/scripts/pr_workflow.py

@@ -115,7 +115,7 @@ def run_pr_label_action(self) -> None:
             self.add_remove_pr_labels()
 
         if self.action == self.SupportedActions.welcome_comment_action_name:
-            self.add_welcome_comment()
+            self.add_welcome_comment_set_assignee()
 
     def get_pr_size(self) -> int:
         additions: int = 0
@@ -294,8 +294,9 @@ def issue_comment_label_actions(
             if commented_by_label not in self.pr_labels:
                 self.add_pr_label(label=commented_by_label)
 
-    def add_welcome_comment(self) -> None:
+    def add_welcome_comment_set_assignee(self) -> None:
         self.pr.create_issue_comment(body=WELCOME_COMMENT)
+        self.pr.add_to_assignees(self.pr.user.login)
 
 
 def main() -> None: