Merge pull request #1433 from sendbird/chore/auto-approve-release-pr

[chore]: auto-approve release PRs via automation

Author: sf-tyler-jeong

.github/workflows/approve-by-automation.yml

@@ -0,0 +1,29 @@
+name: Approve by automation
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+
+permissions:
+  pull-requests: write
+
+jobs:
+  approve-release-pr:
+    if: github.base_ref == 'main' && startsWith(github.head_ref, 'release/v')
+    runs-on: ubuntu-latest
+    steps:
+      - name: Approve release pull request
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          HEAD_REF: ${{ github.head_ref }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          REPO: ${{ github.repository }}
+        run: |
+          if ! printf '%s' "$HEAD_REF" | grep -qE '^release/v[0-9]+\.[0-9]+\.[0-9]+$'; then
+            echo "Not an exact release/vX.Y.Z branch ('$HEAD_REF'); skipping auto-approval."
+            exit 0
+          fi
+          gh pr review "$PR_NUMBER" \
+            --approve \
+            --body "Auto-approved: release branch PR (release/vX.Y.Z). Release is gated by the Jira EM approval." \
+            --repo "$REPO"