[feature] Automate assigning/unassigning issues #571

Added auto-assignment bot with issue assignment,
management of stale PR, reassignment on PR reopen
and shared helpers in utils.py.

Closes #571

Author: Eeshu-Yadav

.github/actions/bot-autoassign/__main__.py

@@ -0,0 +1,41 @@
+import sys
+import traceback
+
+
+def main():
+    if len(sys.argv) < 2:
+        print(
+            "Usage: python __main__.py <bot_type> [args...]\n"
+            "Available bot types: issue_assignment, stale_pr, pr_reopen"
+        )
+        return 1
+
+    bot_type = sys.argv[1]
+
+    try:
+        sys.argv = [sys.argv[0]] + sys.argv[2:]
+
+        if bot_type == "issue_assignment":
+            from issue_assignment_bot import main as issue_main
+
+            return issue_main()
+        elif bot_type == "stale_pr":
+            from stale_pr_bot import main as stale_main
+
+            return stale_main()
+        elif bot_type == "pr_reopen":
+            from pr_reopen_bot import main as pr_main
+
+            return pr_main()
+        else:
+            print(f"Unknown bot type: {bot_type}")
+            print("Available bot types: " "issue_assignment, stale_pr, pr_reopen")
+            return 1
+    except Exception as e:
+        print(f"Error running {bot_type} bot: {e}")
+        traceback.print_exc()
+        return 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())

.github/actions/bot-autoassign/base.py

@@ -0,0 +1,27 @@
+import os
+
+from github import Github
+
+
+class GitHubBot:
+    def __init__(self):
+        self.github_token = os.environ.get("GITHUB_TOKEN")
+        self.repository_name = os.environ.get("REPOSITORY")
+        self.event_name = os.environ.get("GITHUB_EVENT_NAME")
+        self.event_payload = None
+
+        if self.github_token and self.repository_name:
+            try:
+                self.github = Github(self.github_token)
+                self.repo = self.github.get_repo(self.repository_name)
+            except Exception as e:
+                print(f"Warning: Could not initialize GitHub client: {e}")
+                self.github = None
+                self.repo = None
+        else:
+            print("Warning: GITHUB_TOKEN or REPOSITORY env vars not set")
+            self.github = None
+            self.repo = None
+
+    def load_event_payload(self, event_payload):
+        self.event_payload = event_payload