Add auto-approve workflow for GitHub Copilot agent PRs

Co-authored-by: pamelafox <[email protected]>

Author: Copilot

.github/workflows/auto_approve_copilot.yaml

@@ -0,0 +1,15 @@
+name: Auto-approve Copilot PRs
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+
+jobs:
+  auto-approve:
+    runs-on: ubuntu-latest
+    if: github.actor == 'copilot-swe-agent'
+    steps:
+      - name: Auto-approve PR from Copilot agent
+        uses: hmarr/auto-approve-action@v3
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}