ci: add assign-reviewer job

.github/workflows/automation.yaml

@@ -24,3 +24,26 @@ jobs:
       - uses: actions/labeler@v5
         with:
           repo-token: ${{ github.token }}
+
+  assign-reviewer:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Get previous PR author and assign as reviewer
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        run: |
+          current_repo=${{ github.repository }}
+          current_pr_num=${{ github.event.number }}
+
+          # 최근 3개의 PR 중 현재 PR 작성자와 다른 작성자 찾기
+          previous_pr_author=$(gh pr list --repo $current_repo \
+            --search "-is:closed sort:created-desc -author:$current_pr_author" \
+            --limit 3 --json number,author \
+            --jq 'map(select(.number < '$current_pr_num'))[0].author.login')
+
+          if [ -n "$previous_pr_author" ]; then
+            gh pr edit $current_pr_num --repo $current_repo --add-reviewer $previous_pr_author
+          else
+            echo "❌ No previous PR author found to assign as reviewer"
+            exit 1
+          fi

.gitignore

@@ -2,3 +2,4 @@
 .vscode/
 .DS_Store
 .env
+**/*.iml