feat(ci): add workflow to auto-delete merged branches

Author: swarna1101

.github/workflows/branch-cleanup.yml

@@ -0,0 +1,28 @@
+name: Branch Cleanup
+on:
+  pull_request:
+    types: [closed]
+    branches:
+      - main
+
+jobs:
+  delete-branch:
+    runs-on: ubuntu-latest
+    if: github.event.pull_request.merged == true && github.event.pull_request.head.ref != 'develop'
+    steps:
+      - name: Delete head branch
+        uses: actions/github-script@v7
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const branch = context.payload.pull_request.head.ref;
+            try {
+              await github.rest.git.deleteRef({
+                owner: context.repo.owner,
+                repo: context.repo.name,
+                ref: `heads/${branch}`
+              });
+              console.log(`Deleted branch ${branch}`);
+            } catch (error) {
+              console.error(`Error deleting branch ${branch}:`, error);
+            }