feat: add inactivity bot phase 2 (stale PR detection)

Signed-off-by: Akshat Kumar <akshat230405@gmail.com>

Author: Akshat8510

.github/workflows/bot-inactivity-unassign-phase1.yml

@@ -34,5 +34,5 @@ jobs:
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           REPO: ${{ github.repository }}
-          DAYS: 0
+          DAYS: 21
         run: bash .github/scripts/inactivity_unassign_phase2.sh

.github/workflows/bot-inactivity-unassign-phase2.yml

@@ -20,10 +20,12 @@ jobs:
 
       - name: Harden the runner
         uses: step-security/harden-runner@df199fb7be9f65074067a9eb93f12bb4c5547cf2
+        with:
+          egress-policy: audit
 
       - name: Unassign stale PR contributors (Phase 2)
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           REPO: ${{ github.repository }}
-          DAYS: 0
+          DAYS: 21
         run: bash .github/scripts/inactivity_unassign_phase2.sh

CHANGELOG.md

@@ -7,6 +7,7 @@ This changelog is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.
 ## [Unreleased]
 
 ### Added
+- Phase 2 of the inactivity-unassign bot:Automatically detects stale open pull requests (no commit activity for 21+ days), comments with a helpful InactivityBot message, closes the stale PR, and unassigns the contributor from the linked issue.
 - Added a github template for good first issues
 - Added `.github/workflows/bot-assignment-check.yml` to limit non-maintainers to 2 concurrent issue assignments.
 - Add examples/tokens/token_create_transaction_pause_key.py example demonstrating token pause/unpause behavior and pause key usage (#833)