feat: 슬랙 연동 yaml 파일 설정

Author: chw0912

.github/workflows/slack-pr.yml

@@ -0,0 +1,19 @@
+name: Slack PR Notification
+on:
+  pull_request:
+    types: [opened, closed, reopened]
+  pull_request_review:
+    types: [submitted]
+jobs:
+  slack-notify:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Send PR event to Slack
+        uses: slackapi/[email protected]
+        with:
+          payload: |
+            {
+              "text": "${{ github.event.action == 'submitted' && ':돋보기: PR 리뷰가 등록되었습니다' || github.event.action == 'closed' && github.event.pull_request.merged && ':흰색_확인_표시: PR이 머지되었습니다' || github.event.action == 'opened' && ':로켓: 새 PR이 생성되었습니다' || ':시계_반대_방향_화살표: PR 이벤트가 발생했습니다' }}: *${{ github.event.pull_request.title }}* by `${{ github.event.pull_request.user.login }}`\n<${{ github.event.pull_request.html_url }}|PR 보러가기>"
+            }
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}