Add GitHub Action: Google Calendar integration for meetup issues

.github/workflows/add-assignee-to-calendar.yml

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+name: Add Assignee to Google Calendar Event
+
+on:
+  issues:
+    types: [assigned]
+
+jobs:
+  add-assignee:
+    runs-on: ubuntu-latest
+    # 모각코 이슈 형식에만 실행 (예: "285th online meetup, 2026-05-02")
+    if: ${{ contains(github.event.issue.title, 'online meetup,') }}
+
+    steps:
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.x'
+
+      - name: Install dependencies
+        run: pip install google-auth google-api-python-client
+
+      - name: Add assignee as guest to calendar event
+        env:
+          GOOGLE_SERVICE_ACCOUNT_KEY: ${{ secrets.GOOGLE_SERVICE_ACCOUNT_KEY }}
+          GOOGLE_CALENDAR_ID: ${{ secrets.GOOGLE_CALENDAR_ID }}
+          ASSIGNEE_LOGIN: ${{ github.event.assignee.login }}
+          ISSUE_NUMBER: ${{ github.event.issue.number }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          CALENDAR_EMAIL_MAP: ${{ vars.CALENDAR_EMAIL_MAP }}
+        run: |
+          python - <<'PYTHON'
+          import os, json, time, subprocess
+          from google.oauth2 import service_account
+          from googleapiclient.discovery import build
+
+          login = os.environ['ASSIGNEE_LOGIN']
+
+          # 1순위: GitHub 계정의 public email 조회
+          result = subprocess.run(
+              ['gh', 'api', f'/users/{login}', '--jq', '.email'],
+              capture_output=True, text=True, env={**os.environ}
+          )
+          email = result.stdout.strip()
+          if email == 'null':
+              email = ''
+
+          # 2순위: GitHub public email이 없으면 CALENDAR_EMAIL_MAP variable 확인
+          if not email:
+              email_map = json.loads(os.environ.get('CALENDAR_EMAIL_MAP') or '{}')
+              email = email_map.get(login, '')
+              if email:
+                  print(f"Using mapped email for {login}: {email}")
+              else:
+                  print(f"Skipping {login}: no email found. "
+                        f"Add '{login}: <email>' to CALENDAR_EMAIL_MAP variable to enable.")
+                  exit(0)
+
+          key_info = json.loads(os.environ['GOOGLE_SERVICE_ACCOUNT_KEY'])
+          credentials = service_account.Credentials.from_service_account_info(
+              key_info, scopes=['https://www.googleapis.com/auth/calendar']
+          )
+          service = build('calendar', 'v3', credentials=credentials)
+          calendar_id = os.environ['GOOGLE_CALENDAR_ID']
+          issue_number = os.environ['ISSUE_NUMBER']
+
+          # issues:opened 워크플로우와의 경쟁 조건 처리:
+          # 이슈 생성 시 opened와 assigned가 동시에 트리거되므로
+          # 캘린더 이벤트가 아직 생성 중일 수 있어 최대 3회 재시도
+          event = None
+          for attempt in range(3):
+              events = service.events().list(
+                  calendarId=calendar_id,
+                  privateExtendedProperty=f'github_issue_number={issue_number}'
+              ).execute()
+              items = events.get('items', [])
+              if items:
+                  event = items[0]
+                  break
+              print(f"Event not found yet, retrying in 15s... ({attempt + 1}/3)")
+              time.sleep(15)
+
+          if not event:
+              print(f"Calendar event not found for issue #{issue_number}")
+              exit(1)
+
+          # 중복 추가 방지
+          attendees = event.get('attendees', [])
+          if any(a.get('email') == email for a in attendees):
+              print(f"{login} ({email}) is already a guest")
+              exit(0)
+
+          attendees.append({'email': email})
+          service.events().patch(
+              calendarId=calendar_id,
+              eventId=event['id'],
+              body={'attendees': attendees},
+              sendUpdates='none',
+          ).execute()
+
+          print(f"Added {login} ({email}) as guest to the calendar event")
+          PYTHON

.github/workflows/add-to-google-calendar.yml

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+name: Add Meetup to Google Calendar
+
+on:
+  issues:
+    types: [opened]
+
+jobs:
+  add-to-calendar:
+    runs-on: ubuntu-latest
+    # 모각코 이슈 형식에만 실행 (예: "285th online meetup, 2026-05-02")
+    if: ${{ contains(github.event.issue.title, 'online meetup,') }}
+
+    steps:
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.x'
+
+      - name: Install dependencies
+        run: pip install google-auth google-api-python-client pytz
+
+      - name: Add event to Google Calendar
+        env:
+          GOOGLE_SERVICE_ACCOUNT_KEY: ${{ secrets.GOOGLE_SERVICE_ACCOUNT_KEY }}
+          GOOGLE_CALENDAR_ID: ${{ secrets.GOOGLE_CALENDAR_ID }}
+          ISSUE_TITLE: ${{ github.event.issue.title }}
+          ISSUE_URL: ${{ github.event.issue.html_url }}
+          ISSUE_NUMBER: ${{ github.event.issue.number }}
+        run: |
+          python - <<'PYTHON'
+          import os, json, re
+          from datetime import datetime
+          import pytz
+          from google.oauth2 import service_account
+          from googleapiclient.discovery import build
+
+          title = os.environ['ISSUE_TITLE']
+          match = re.match(r'(\d+)th online meetup, (\d{4}-\d{2}-\d{2})', title)
+          if not match:
+              print(f"Skipping: title doesn't match meetup format: {title}")
+              exit(0)
+
+          meeting_num, date_str = match.group(1), match.group(2)
+          tz = pytz.timezone('Asia/Seoul')
+          date = datetime.strptime(date_str, '%Y-%m-%d')
+          start = tz.localize(date.replace(hour=10, minute=30))
+          end = tz.localize(date.replace(hour=12, minute=30))
+
+          key_info = json.loads(os.environ['GOOGLE_SERVICE_ACCOUNT_KEY'])
+          credentials = service_account.Credentials.from_service_account_info(
+              key_info, scopes=['https://www.googleapis.com/auth/calendar']
+          )
+          service = build('calendar', 'v3', credentials=credentials)
+
+          event = {
+              'summary': f'온라인 모각코 {meeting_num}회',
+              'location': 'https://meet.google.com/jyx-mxnq-kpk',
+              'description': (
+                  f'Google Meet: https://meet.google.com/jyx-mxnq-kpk\n\n'
+                  f'Issue: {os.environ["ISSUE_URL"]}'
+              ),
+              'start': {'dateTime': start.isoformat(), 'timeZone': 'Asia/Seoul'},
+              'end': {'dateTime': end.isoformat(), 'timeZone': 'Asia/Seoul'},
+              # issues: assigned 워크플로우에서 이 이벤트를 찾기 위해 이슈 번호를 저장
+              'extendedProperties': {
+                  'private': {
+                      'github_issue_number': os.environ['ISSUE_NUMBER']
+                  }
+              },
+          }
+
+          result = service.events().insert(
+              calendarId=os.environ['GOOGLE_CALENDAR_ID'],
+              body=event,
+              sendUpdates='none',
+          ).execute()
+
+          print(f"Event created: {result.get('htmlLink')}")
+          PYTHON