feat: pr issue close workflow 생성 (#328)

.github/workflows/pr-issue-close.yml

@@ -0,0 +1,33 @@
+name: Close Issue on PR Merge
+
+on:
+  pull_request:
+    types: [closed]
+
+jobs:
+  close-issue:
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Extract issue number from PR body
+        id: extract_issue
+        run: |
+          # Fetch PR body
+          PR_BODY=$(curl -s -H "Authorization: token ${{ secrets.CONFIG_SUBMODULE_TOKEN }}" \
+            "https://api.github.com/repos/${{ github.repository }}/issues/${{ github.event.pull_request.number }}" \
+            | jq -r '.body')
+          # Extract issue number from PR body using regex (customize if needed)
+          ISSUE_NUMBER=$(echo "$PR_BODY" | grep -oP '#\d+' | head -1 | sed 's/#//')
+          echo "ISSUE_NUMBER=$ISSUE_NUMBER" >> $GITHUB_ENV
+      - name: Close associated issue
+        if: env.ISSUE_NUMBER != ''
+        run: |
+          echo "Closing issue #${{ env.ISSUE_NUMBER }}"
+          curl -s -X PATCH -H "Authorization: token ${{ secrets.CONFIG_SUBMODULE_TOKEN }}" \
+            -H "Accept: application/vnd.github.v3+json" \
+            -d '{"state": "closed"}' \
+            "https://api.github.com/repos/${{ github.repository }}/issues/${{ env.ISSUE_NUMBER }}"